[bsp/raspberry-pi] add raspi2/cpu

bsp/raspberry-pi/raspi2/SConstruct

@@ -22,7 +22,7 @@ Export('RTT_ROOT')
 Export('rtconfig')
 
 # prepare building environment
-objs = PrepareBuilding(env, RTT_ROOT, has_libcpu = False)
+objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=True)
 
 # make a building
 DoBuilding(TARGET, objs)

bsp/raspberry-pi/raspi2/cpu/SConscript

@@ -0,0 +1,9 @@
+from building import *
+
+cwd     = GetCurrentDir()
+src     = Glob('*.c') + Glob('*.cpp') + Glob('*_gcc.S')
+CPPPATH = [cwd]
+
+group = DefineGroup('cpu', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

bsp/raspberry-pi/raspi2/cpu/armv7.h

@@ -0,0 +1,64 @@
+#ifndef __ARMV7_H__
+#define __ARMV7_H__
+
+/* the exception stack without VFP registers */
+struct rt_hw_exp_stack
+{
+    unsigned long r0;
+    unsigned long r1;
+    unsigned long r2;
+    unsigned long r3;
+    unsigned long r4;
+    unsigned long r5;
+    unsigned long r6;
+    unsigned long r7;
+    unsigned long r8;
+    unsigned long r9;
+    unsigned long r10;
+    unsigned long fp;
+    unsigned long ip;
+    unsigned long sp;
+    unsigned long lr;
+    unsigned long pc;
+    unsigned long cpsr;
+};
+
+struct rt_hw_stack
+{
+    unsigned long cpsr;
+    unsigned long r0;
+    unsigned long r1;
+    unsigned long r2;
+    unsigned long r3;
+    unsigned long r4;
+    unsigned long r5;
+    unsigned long r6;
+    unsigned long r7;
+    unsigned long r8;
+    unsigned long r9;
+    unsigned long r10;
+    unsigned long fp;
+    unsigned long ip;
+    unsigned long lr;
+    unsigned long pc;
+};
+
+#define USERMODE    0x10
+#define FIQMODE     0x11
+#define IRQMODE     0x12
+#define SVCMODE     0x13
+#define MONITORMODE 0x16
+#define ABORTMODE   0x17
+#define HYPMODE     0x1b
+#define UNDEFMODE   0x1b
+#define MODEMASK    0x1f
+#define NOINT       0xc0
+
+#define T_Bit       (1<<5)
+#define F_Bit       (1<<6)
+#define I_Bit       (1<<7)
+#define A_Bit       (1<<8)
+#define E_Bit       (1<<9)
+#define J_Bit       (1<<24)
+
+#endif

bsp/raspberry-pi/raspi2/cpu/context_gcc.S

@@ -0,0 +1,105 @@
+/*
+ * File      : context.S
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2013-07-05     Bernard      the first version
+ */
+
+.section .text, "ax"
+/*
+ * rt_base_t rt_hw_interrupt_disable();
+ */
+.globl rt_hw_interrupt_disable
+rt_hw_interrupt_disable:
+    mrs r0, cpsr
+    cpsid i
+    bx  lr
+
+/*
+ * void rt_hw_interrupt_enable(rt_base_t level);
+ */
+.globl rt_hw_interrupt_enable
+rt_hw_interrupt_enable:
+    msr cpsr_c, r0
+    bx  lr
+
+/*
+ * void rt_hw_context_switch_to(rt_uint32 to);
+ * r0 --> to
+ */
+.globl rt_hw_context_switch_to
+rt_hw_context_switch_to:
+    ldr sp, [r0]            @ get new task stack pointer
+
+    ldmfd sp!, {r4}         @ pop new task spsr
+    msr spsr_cxsf, r4
+
+    ldmfd sp!, {r0-r12, lr, pc}^   @ pop new task r0-r12, lr & pc
+
+.section .bss.share.isr
+_guest_switch_lvl:
+    .word 0
+
+.globl vmm_virq_update
+
+.section .text.isr, "ax"
+/*
+ * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
+ * r0 --> from
+ * r1 --> to
+ */
+.globl rt_hw_context_switch
+rt_hw_context_switch:
+    stmfd   sp!, {lr}       @ push pc (lr should be pushed in place of PC)
+    stmfd   sp!, {r0-r12, lr}   @ push lr & register file
+
+    mrs r4, cpsr
+    tst lr, #0x01
+    orrne r4, r4, #0x20     @ it's thumb code
+
+    stmfd sp!, {r4}         @ push cpsr
+
+    str sp, [r0]            @ store sp in preempted tasks TCB
+    ldr sp, [r1]            @ get new task stack pointer
+
+    ldmfd sp!, {r4}         @ pop new task cpsr to spsr
+    msr spsr_cxsf, r4
+    ldmfd sp!, {r0-r12, lr, pc}^  @ pop new task r0-r12, lr & pc, copy spsr to cpsr
+
+/*
+ * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
+ */
+.globl rt_thread_switch_interrupt_flag
+.globl rt_interrupt_from_thread
+.globl rt_interrupt_to_thread
+.globl rt_hw_context_switch_interrupt
+rt_hw_context_switch_interrupt:
+    ldr r2, =rt_thread_switch_interrupt_flag
+    ldr r3, [r2]
+    cmp r3, #1
+    beq _reswitch
+    ldr ip, =rt_interrupt_from_thread   @ set rt_interrupt_from_thread
+    mov r3, #1              @ set rt_thread_switch_interrupt_flag to 1
+    str r0, [ip]
+    str r3, [r2]
+_reswitch:
+    ldr r2, =rt_interrupt_to_thread     @ set rt_interrupt_to_thread
+    str r1, [r2]
+    bx  lr

bsp/raspberry-pi/raspi2/cpu/cp15.h

@@ -0,0 +1,12 @@
+#ifndef __CP15_H__
+#define __CP15_H__
+
+unsigned long rt_cpu_get_smp_id(void);
+
+void rt_cpu_mmu_disable(void);
+void rt_cpu_mmu_enable(void);
+void rt_cpu_tlb_set(volatile unsigned long*);
+
+void rt_cpu_vector_set_base(unsigned int addr);
+
+#endif

bsp/raspberry-pi/raspi2/cpu/cp15_gcc.S

@@ -0,0 +1,140 @@
+/*
+ * File      : cp15_gcc.S
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013, RT-Thread Development Team
+ * http://www.rt-thread.org
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2013-07-05     Bernard      the first version
+ */
+
+.globl rt_cpu_get_smp_id
+rt_cpu_get_smp_id:
+    mrc     p15, #0, r0, c0, c0, #5
+    bx      lr
+
+.globl rt_cpu_vector_set_base
+rt_cpu_vector_set_base:
+    mcr     p15, #0, r0, c12, c0, #0
+    dsb
+    bx      lr
+
+.globl rt_hw_cpu_dcache_enable
+rt_hw_cpu_dcache_enable:
+    mrc     p15, #0, r0, c1, c0, #0
+    orr     r0,  r0, #0x00000004
+    mcr     p15, #0, r0, c1, c0, #0
+    bx      lr
+
+.globl rt_hw_cpu_icache_enable
+rt_hw_cpu_icache_enable:
+    mrc     p15, #0, r0, c1, c0, #0
+    orr     r0,  r0, #0x00001000
+    mcr     p15, #0, r0, c1, c0, #0
+    bx      lr
+
+_FLD_MAX_WAY:
+   .word  0x3ff
+_FLD_MAX_IDX:
+   .word  0x7ff
+
+.globl rt_cpu_dcache_clean_flush
+rt_cpu_dcache_clean_flush:
+    push    {r4-r11}
+    dmb
+    mrc     p15, #1, r0, c0, c0, #1  @ read clid register
+    ands    r3, r0, #0x7000000       @ get level of coherency
+    mov     r3, r3, lsr #23
+    beq     finished
+    mov     r10, #0
+loop1:
+    add     r2, r10, r10, lsr #1
+    mov     r1, r0, lsr r2
+    and     r1, r1, #7
+    cmp     r1, #2
+    blt     skip
+    mcr     p15, #2, r10, c0, c0, #0
+    isb
+    mrc     p15, #1, r1, c0, c0, #0
+    and     r2, r1, #7
+    add     r2, r2, #4
+    ldr     r4, _FLD_MAX_WAY
+    ands    r4, r4, r1, lsr #3
+    clz     r5, r4
+    ldr     r7, _FLD_MAX_IDX
+    ands    r7, r7, r1, lsr #13
+loop2:
+    mov     r9, r4
+loop3:
+    orr     r11, r10, r9, lsl r5
+    orr     r11, r11, r7, lsl r2
+    mcr     p15, #0, r11, c7, c14, #2
+    subs    r9, r9, #1
+    bge     loop3
+    subs    r7, r7, #1
+    bge     loop2
+skip:
+    add     r10, r10, #2
+    cmp     r3, r10
+    bgt     loop1
+
+finished:
+    dsb
+    isb
+    pop     {r4-r11}
+    bx      lr
+
+.globl rt_hw_cpu_dcache_disable
+rt_hw_cpu_dcache_disable:
+    push    {r4-r11, lr}
+    bl      rt_cpu_dcache_clean_flush
+    mrc     p15, #0, r0, c1, c0, #0
+    bic     r0,  r0, #0x00000004
+    mcr     p15, #0, r0, c1, c0, #0
+    pop     {r4-r11, lr}
+    bx      lr
+
+.globl rt_hw_cpu_icache_disable
+rt_hw_cpu_icache_disable:
+    mrc     p15, #0, r0, c1, c0, #0
+    bic     r0,  r0, #0x00001000
+    mcr     p15, #0, r0, c1, c0, #0
+    bx      lr
+
+.globl rt_cpu_mmu_disable
+rt_cpu_mmu_disable:
+    mcr     p15, #0, r0, c8, c7, #0    @ invalidate tlb
+    mrc     p15, #0, r0, c1, c0, #0
+    bic     r0, r0, #1
+    mcr     p15, #0, r0, c1, c0, #0    @ clear mmu bit
+    dsb
+    bx      lr
+
+.globl rt_cpu_mmu_enable
+rt_cpu_mmu_enable:
+    mrc     p15, #0, r0, c1, c0, #0
+    orr     r0, r0, #0x001
+    mcr     p15, #0, r0, c1, c0, #0    @ set mmu enable bit
+    dsb
+    bx      lr
+
+.globl rt_cpu_tlb_set
+rt_cpu_tlb_set:
+    mcr     p15, #0, r0, c2, c0, #0
+    dmb
+    bx      lr

bsp/raspberry-pi/raspi2/cpu/cpu.c

@@ -0,0 +1,37 @@
+/*
+ * File      : cpu.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Develop Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2011-09-15     Bernard      first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <board.h>
+
+/**
+ * @addtogroup AM33xx
+ */
+/*@{*/
+
+/** shutdown CPU */
+void rt_hw_cpu_shutdown()
+{
+    rt_uint32_t level;
+    rt_kprintf("shutdown...\n");
+
+    level = rt_hw_interrupt_disable();
+    while (level)
+    {
+        RT_ASSERT(0);
+    }
+}
+
+/*@}*/

bsp/raspberry-pi/raspi2/cpu/interrupt.c

@@ -0,0 +1,136 @@
+/*
+ * File      : interrupt.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013-2014, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018/5/3       Bernard      first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#include "cp15.h"
+#include <board.h>
+
+#define MAX_HANDLERS                64
+
+extern volatile rt_uint8_t rt_interrupt_nest;
+
+/* exception and interrupt handler table */
+struct rt_irq_desc isr_table[MAX_HANDLERS];
+
+rt_uint32_t rt_interrupt_from_thread;
+rt_uint32_t rt_interrupt_to_thread;
+rt_uint32_t rt_thread_switch_interrupt_flag;
+
+extern int system_vectors;
+
+static void default_isr_handler(int vector, void *param)
+{
+    rt_kprintf("unhandled irq: %d\n", vector);
+}
+
+/**
+ * This function will initialize hardware interrupt
+ */
+void rt_hw_interrupt_init(void)
+{
+    uint32_t index;
+
+    /* mask all of interrupts */
+    IRQ_DISABLE_BASIC = 0x000000ff;
+    IRQ_DISABLE1      = 0xffffffff;
+    IRQ_DISABLE2      = 0xffffffff;
+
+    for (index = 0; index < MAX_HANDLERS; index ++)
+    {
+        isr_table[index].handler = default_isr_handler;
+        isr_table[index].param = NULL;
+#ifdef RT_USING_INTERRUPT_INFO
+        rt_strncpy(isr_table[index].name, "unknown", RT_NAME_MAX);
+        isr_table[index].counter = 0;
+#endif
+    }
+
+    /* init interrupt nest, and context in thread sp */
+    rt_interrupt_nest = 0;
+    rt_interrupt_from_thread = 0;
+    rt_interrupt_to_thread = 0;
+    rt_thread_switch_interrupt_flag = 0;
+}
+
+/**
+ * This function will mask a interrupt.
+ * @param vector the interrupt number
+ */
+void rt_hw_interrupt_mask(int vector)
+{
+    if (vector < 8)
+    {
+        IRQ_DISABLE_BASIC = (1 << vector);
+    }
+    else if (vector < 32)
+    {
+        IRQ_DISABLE1 = (1 << vector);
+    }
+    else
+    {
+        vector = vector % 32;
+        IRQ_DISABLE2 = (1 << vector);
+    }
+}
+
+/**
+ * This function will un-mask a interrupt.
+ * @param vector the interrupt number
+ */
+void rt_hw_interrupt_umask(int vector)
+{
+    if (vector < 8)
+    {
+        IRQ_ENABLE_BASIC = (1 << vector);
+    }
+    else if (vector < 32)
+    {
+        IRQ_ENABLE1 = (1 << vector);
+    }
+    else
+    {
+        vector = vector % 32;
+        IRQ_ENABLE2 = (1 << vector);
+    }
+}
+
+/**
+ * This function will install a interrupt service routine to a interrupt.
+ * @param vector the interrupt number
+ * @param new_handler the interrupt service routine to be installed
+ * @param old_handler the old interrupt service routine
+ */
+rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
+        void *param, const char *name)
+{
+    rt_isr_handler_t old_handler = RT_NULL;
+
+    if (vector < MAX_HANDLERS)
+    {
+        old_handler = isr_table[vector].handler;
+
+        if (handler != RT_NULL)
+        {
+#ifdef RT_USING_INTERRUPT_INFO
+            rt_strncpy(isr_table[vector].name, name, RT_NAME_MAX);
+#endif /* RT_USING_INTERRUPT_INFO */
+            isr_table[vector].handler = handler;
+            isr_table[vector].param = param;
+        }
+    }
+
+    return old_handler;
+}

bsp/raspberry-pi/raspi2/cpu/mmu.c

@@ -0,0 +1,207 @@
+/*
+ * File      : mmu.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-01-10     bernard      porting to AM1808
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <board.h>
+
+#include "cp15.h"
+
+#define DESC_SEC       (0x2)
+#define CB             (3<<2)  //cache_on, write_back
+#define CNB            (2<<2)  //cache_on, write_through
+#define NCB            (1<<2)  //cache_off,WR_BUF on
+#define NCNB           (0<<2)  //cache_off,WR_BUF off
+#define AP_RW          (3<<10) //supervisor=RW, user=RW
+#define AP_RO          (2<<10) //supervisor=RW, user=RO
+#define XN             (1<<4)  // eXecute Never
+
+#define DOMAIN_FAULT   (0x0)
+#define DOMAIN_CHK     (0x1)
+#define DOMAIN_NOTCHK  (0x3)
+#define DOMAIN0        (0x0<<5)
+#define DOMAIN1        (0x1<<5)
+
+#define DOMAIN0_ATTR   (DOMAIN_CHK<<0)
+#define DOMAIN1_ATTR   (DOMAIN_FAULT<<2)
+
+/* Read/Write, cache, write back */
+#define RW_CB          (AP_RW|DOMAIN0|CB|DESC_SEC)
+/* Read/Write, cache, write through */
+#define RW_CNB         (AP_RW|DOMAIN0|CNB|DESC_SEC)
+/* Read/Write without cache and write buffer */
+#define RW_NCNB        (AP_RW|DOMAIN0|NCNB|DESC_SEC)
+/* Read/Write without cache and write buffer, no execute */
+#define RW_NCNBXN      (AP_RW|DOMAIN0|NCNB|DESC_SEC|XN)
+/* Read/Write without cache and write buffer */
+#define RW_FAULT       (AP_RW|DOMAIN1|NCNB|DESC_SEC)
+
+/* dump 2nd level page table */
+void rt_hw_cpu_dump_page_table_2nd(rt_uint32_t *ptb)
+{
+    int i;
+    int fcnt = 0;
+
+    for (i = 0; i < 256; i++)
+    {
+        rt_uint32_t pte2 = ptb[i];
+        if ((pte2 & 0x3) == 0)
+        {
+            if (fcnt == 0)
+                rt_kprintf("    ");
+            rt_kprintf("%04x: ", i);
+            fcnt++;
+            if (fcnt == 16)
+            {
+                rt_kprintf("fault\n");
+                fcnt = 0;
+            }
+            continue;
+        }
+        if (fcnt != 0)
+        {
+            rt_kprintf("fault\n");
+            fcnt = 0;
+        }
+
+        rt_kprintf("    %04x: %x: ", i, pte2);
+        if ((pte2 & 0x3) == 0x1)
+        {
+            rt_kprintf("L,ap:%x,xn:%d,texcb:%02x\n",
+                       ((pte2 >> 7) | (pte2 >> 4))& 0xf,
+                       (pte2 >> 15) & 0x1,
+                       ((pte2 >> 10) | (pte2 >> 2)) & 0x1f);
+        }
+        else
+        {
+            rt_kprintf("S,ap:%x,xn:%d,texcb:%02x\n",
+                       ((pte2 >> 7) | (pte2 >> 4))& 0xf, pte2 & 0x1,
+                       ((pte2 >> 4) | (pte2 >> 2)) & 0x1f);
+        }
+    }
+}
+
+void rt_hw_cpu_dump_page_table(rt_uint32_t *ptb)
+{
+    int i;
+    int fcnt = 0;
+
+    rt_kprintf("page table@%p\n", ptb);
+    for (i = 0; i < 1024*4; i++)
+    {
+        rt_uint32_t pte1 = ptb[i];
+        if ((pte1 & 0x3) == 0)
+        {
+            rt_kprintf("%03x: ", i);
+            fcnt++;
+            if (fcnt == 16)
+            {
+                rt_kprintf("fault\n");
+                fcnt = 0;
+            }
+            continue;
+        }
+        if (fcnt != 0)
+        {
+            rt_kprintf("fault\n");
+            fcnt = 0;
+        }
+
+        rt_kprintf("%03x: %08x: ", i, pte1);
+        if ((pte1 & 0x3) == 0x3)
+        {
+            rt_kprintf("LPAE\n");
+        }
+        else if ((pte1 & 0x3) == 0x1)
+        {
+            rt_kprintf("pte,ns:%d,domain:%d\n",
+                       (pte1 >> 3) & 0x1, (pte1 >> 5) & 0xf);
+            /*
+             *rt_hw_cpu_dump_page_table_2nd((void*)((pte1 & 0xfffffc000)
+             *                               - 0x80000000 + 0xC0000000));
+             */
+        }
+        else if (pte1 & (1 << 18))
+        {
+            rt_kprintf("super section,ns:%d,ap:%x,xn:%d,texcb:%02x\n",
+                       (pte1 >> 19) & 0x1,
+                       ((pte1 >> 13) | (pte1 >> 10))& 0xf,
+                       (pte1 >> 4) & 0x1,
+                       ((pte1 >> 10) | (pte1 >> 2)) & 0x1f);
+        }
+        else
+        {
+            rt_kprintf("section,ns:%d,ap:%x,"
+                       "xn:%d,texcb:%02x,domain:%d\n",
+                       (pte1 >> 19) & 0x1,
+                       ((pte1 >> 13) | (pte1 >> 10))& 0xf,
+                       (pte1 >> 4) & 0x1,
+                       (((pte1 & (0x7 << 12)) >> 10) |
+                        ((pte1 &        0x0c) >>  2)) & 0x1f,
+                       (pte1 >> 5) & 0xf);
+        }
+    }
+}
+
+/* level1 page table, each entry for 1MB memory. */
+volatile static unsigned long MMUTable[4*1024] __attribute__((aligned(16*1024)));
+void rt_hw_mmu_setmtt(rt_uint32_t vaddrStart,
+                      rt_uint32_t vaddrEnd,
+                      rt_uint32_t paddrStart,
+                      rt_uint32_t attr)
+{
+    volatile rt_uint32_t *pTT;
+    volatile int i, nSec;
+    pTT  = (rt_uint32_t *)MMUTable + (vaddrStart >> 20);
+    nSec = (vaddrEnd >> 20) - (vaddrStart >> 20);
+    for(i = 0; i <= nSec; i++)
+    {
+        *pTT = attr | (((paddrStart >> 20) + i) << 20);
+        pTT++;
+    }
+}
+
+unsigned long rt_hw_set_domain_register(unsigned long domain_val)
+{
+    unsigned long old_domain;
+
+    asm volatile ("mrc p15, 0, %0, c3, c0\n" : "=r" (old_domain));
+    asm volatile ("mcr p15, 0, %0, c3, c0\n" : :"r" (domain_val) : "memory");
+
+    return old_domain;
+}
+
+void rt_hw_mmu_init(void)
+{
+    rt_hw_cpu_dcache_disable();
+    rt_hw_cpu_icache_disable();
+    rt_cpu_mmu_disable();
+
+    /* set page table */
+    /* 4G 1:1 memory */
+    rt_hw_mmu_setmtt(0, 0xffffffff-1, 0, RW_CB);
+    /* IO memory region */
+    rt_hw_mmu_setmtt(0x44000000, 0x80000000-1, 0x44000000, RW_NCNBXN);
+
+    /*rt_hw_cpu_dump_page_table(MMUTable);*/
+    rt_hw_set_domain_register(0x55555555);
+
+    rt_cpu_tlb_set(MMUTable);
+
+    rt_cpu_mmu_enable();
+
+    rt_hw_cpu_icache_enable();
+    rt_hw_cpu_dcache_enable();
+}
+

bsp/raspberry-pi/raspi2/cpu/stack.c

@@ -0,0 +1,68 @@
+/*
+ * File      : stack.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2011-09-23     Bernard      the first version
+ * 2011-10-05     Bernard      add thumb mode
+ */
+#include <rtthread.h>
+#include <board.h>
+#include <armv7.h>
+
+/**
+ * @addtogroup AM33xx
+ */
+/*@{*/
+
+/**
+ * This function will initialize thread stack
+ *
+ * @param tentry the entry of thread
+ * @param parameter the parameter of entry
+ * @param stack_addr the beginning stack address
+ * @param texit the function will be called when thread exit
+ *
+ * @return stack address
+ */
+rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
+                             rt_uint8_t *stack_addr, void *texit)
+{
+    rt_uint32_t *stk;
+
+    stack_addr += sizeof(rt_uint32_t);
+    stack_addr  = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);
+    stk      = (rt_uint32_t *)stack_addr;
+    *(--stk) = (rt_uint32_t)tentry;         /* entry point */
+    *(--stk) = (rt_uint32_t)texit;          /* lr */
+    *(--stk) = 0xdeadbeef;                  /* r12 */
+    *(--stk) = 0xdeadbeef;                  /* r11 */
+    *(--stk) = 0xdeadbeef;                  /* r10 */
+    *(--stk) = 0xdeadbeef;                  /* r9 */
+    *(--stk) = 0xdeadbeef;                  /* r8 */
+    *(--stk) = 0xdeadbeef;                  /* r7 */
+    *(--stk) = 0xdeadbeef;                  /* r6 */
+    *(--stk) = 0xdeadbeef;                  /* r5 */
+    *(--stk) = 0xdeadbeef;                  /* r4 */
+    *(--stk) = 0xdeadbeef;                  /* r3 */
+    *(--stk) = 0xdeadbeef;                  /* r2 */
+    *(--stk) = 0xdeadbeef;                  /* r1 */
+    *(--stk) = (rt_uint32_t)parameter;      /* r0 : argument */
+
+    /* cpsr */
+    if ((rt_uint32_t)tentry & 0x01)
+        *(--stk) = SVCMODE | 0x20;          /* thumb mode */
+    else
+        *(--stk) = SVCMODE;                 /* arm mode   */
+
+    /* return task's current stack address */
+    return (rt_uint8_t *)stk;
+}
+
+/*@}*/

bsp/raspberry-pi/raspi2/cpu/start_gcc.S

@@ -0,0 +1,280 @@
+/*
+ * File      : start_gcc.S
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013-2014, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2013-07-05     Bernard      the first version
+ */
+
+.equ Mode_USR,        0x10
+.equ Mode_FIQ,        0x11
+.equ Mode_IRQ,        0x12
+.equ Mode_SVC,        0x13
+.equ Mode_ABT,        0x17
+.equ Mode_UND,        0x1B
+.equ Mode_SYS,        0x1F
+
+.equ I_Bit,           0x80            @ when I bit is set, IRQ is disabled
+.equ F_Bit,           0x40            @ when F bit is set, FIQ is disabled
+
+.equ UND_Stack_Size,     0x00000000
+.equ SVC_Stack_Size,     0x00000100
+.equ ABT_Stack_Size,     0x00000000
+.equ RT_FIQ_STACK_PGSZ,  0x00000000
+.equ RT_IRQ_STACK_PGSZ,  0x00000100
+.equ USR_Stack_Size,     0x00000100
+
+#define ISR_Stack_Size  (UND_Stack_Size + SVC_Stack_Size + ABT_Stack_Size + \
+                 RT_FIQ_STACK_PGSZ + RT_IRQ_STACK_PGSZ)
+
+.section .data.share.isr
+/* stack */
+.globl stack_start
+.globl stack_top
+
+.align 3
+stack_start:
+.rept ISR_Stack_Size
+.byte 0
+.endr
+stack_top:
+
+.text
+/* reset entry */
+.globl _reset
+_reset:
+	/* Disable IRQ & FIQ */
+	cpsid if
+
+	/* Check for HYP mode */
+	mrs r0, cpsr_all
+	and r0, r0, #0x1F
+	mov r8, #0x1A
+	cmp r0, r8
+	beq overHyped
+	b continue
+
+overHyped: /* Get out of HYP mode */
+	ldr r1, =continue
+	msr ELR_hyp, r1
+	mrs r1, cpsr_all
+	and r1, r1, #0x1f	;@ CPSR_MODE_MASK
+	orr r1, r1, #0x13	;@ CPSR_MODE_SUPERVISOR
+	msr SPSR_hyp, r1
+	eret
+
+continue:
+
+    /* disable smp */
+    bl      arm_smp_disable
+
+    /* disable mmu */
+    bl      rt_cpu_mmu_disable
+    /* set the cpu to SVC32 mode and disable interrupt */
+    mrs     r0, cpsr
+    bic     r0, r0, #0x1f
+    orr     r0, r0, #0x13
+    msr     cpsr_c, r0
+
+    /* setup stack */
+    bl      stack_setup
+
+    /* clear .bss */
+    mov     r0,#0                   /* get a zero                       */
+    ldr     r1,=__bss_start         /* bss start                        */
+    ldr     r2,=__bss_end           /* bss end                          */
+
+bss_loop:
+    cmp     r1,r2                   /* check if data to clear           */
+    strlo   r0,[r1],#4              /* clear 4 bytes                    */
+    blo     bss_loop                /* loop until done                  */
+
+    /* start RT-Thread Kernel */
+    ldr     pc, _rtthread_startup
+_rtthread_startup:
+    .word rtthread_startup
+
+stack_setup:
+    ldr     r0, =stack_top
+
+    @  Set the startup stack for svc
+    mov     sp, r0
+	sub     r0, r0, #SVC_Stack_Size
+
+    @  Enter Undefined Instruction Mode and set its Stack Pointer
+    msr     cpsr_c, #Mode_UND|I_Bit|F_Bit
+    mov     sp, r0
+    sub     r0, r0, #UND_Stack_Size
+
+    @  Enter Abort Mode and set its Stack Pointer
+    msr     cpsr_c, #Mode_ABT|I_Bit|F_Bit
+    mov     sp, r0
+    sub     r0, r0, #ABT_Stack_Size
+
+    @  Enter FIQ Mode and set its Stack Pointer
+    msr     cpsr_c, #Mode_FIQ|I_Bit|F_Bit
+    mov     sp, r0
+    sub     r0, r0, #RT_FIQ_STACK_PGSZ
+
+    @  Enter IRQ Mode and set its Stack Pointer
+    msr     cpsr_c, #Mode_IRQ|I_Bit|F_Bit
+    mov     sp, r0
+    sub     r0, r0, #RT_IRQ_STACK_PGSZ
+
+    /* come back to SVC mode */
+    msr     cpsr_c, #Mode_SVC|I_Bit|F_Bit
+    bx      lr
+
+.text
+;@ void arm_smp_enable(void);
+.globl arm_smp_enable
+arm_smp_enable:
+    mrc p15, 0, r0, c1, c0, 1   ;@ set SMP bit in ACTLR
+    orr r0, r0, #0x40
+    mcr p15, 0, r0, c1, c0, 1
+    bx lr
+
+.text
+;@ void arm_smp_disable(void);
+.globl arm_smp_disable
+arm_smp_disable:
+    mrc p15, 0, r0, c1, c0, 1   ;@ clear SMP bit in ACTLR
+    bic r0, r0, #0x40
+    mcr p15, 0, r0, c1, c0, 1
+    bx lr
+
+/* exception handlers: undef, swi, padt, dabt, resv, irq, fiq          */
+.section .text.isr, "ax"
+    .align  5
+.globl vector_fiq
+vector_fiq:
+    stmfd   sp!,{r0-r7,lr}
+    bl      rt_hw_trap_fiq
+    ldmfd   sp!,{r0-r7,lr}
+    subs    pc, lr, #4
+
+.globl      rt_interrupt_enter
+.globl      rt_interrupt_leave
+.globl      rt_thread_switch_interrupt_flag
+.globl      rt_interrupt_from_thread
+.globl      rt_interrupt_to_thread
+
+.globl      rt_current_thread
+.globl      vmm_thread
+.globl      vmm_virq_check
+
+    .align  5
+.globl vector_irq
+vector_irq:
+    stmfd   sp!, {r0-r12,lr}
+
+    bl      rt_interrupt_enter
+    bl      rt_hw_trap_irq
+    bl      rt_interrupt_leave
+
+    @ if rt_thread_switch_interrupt_flag set, jump to
+    @ rt_hw_context_switch_interrupt_do and don't return
+    ldr     r0, =rt_thread_switch_interrupt_flag
+    ldr     r1, [r0]
+    cmp     r1, #1
+    beq     rt_hw_context_switch_interrupt_do
+
+    ldmfd   sp!, {r0-r12,lr}
+    subs    pc,  lr, #4
+
+rt_hw_context_switch_interrupt_do:
+    mov     r1,  #0         @ clear flag
+    str     r1,  [r0]
+
+    mov     r1, sp          @ r1 point to {r0-r3} in stack
+    add     sp, sp, #4*4
+    ldmfd   sp!, {r4-r12,lr}@ reload saved registers
+    mrs     r0,  spsr       @ get cpsr of interrupt thread
+    sub     r2,  lr, #4     @ save old task's pc to r2
+
+    @ Switch to SVC mode with no interrupt. If the usr mode guest is
+    @ interrupted, this will just switch to the stack of kernel space.
+    @ save the registers in kernel space won't trigger data abort.
+    msr     cpsr_c, #I_Bit|F_Bit|Mode_SVC
+
+    stmfd   sp!, {r2}       @ push old task's pc
+    stmfd   sp!, {r4-r12,lr}@ push old task's lr,r12-r4
+    ldmfd   r1,  {r1-r4}    @ restore r0-r3 of the interrupt thread
+    stmfd   sp!, {r1-r4}    @ push old task's r0-r3
+    stmfd   sp!, {r0}       @ push old task's cpsr
+
+    ldr     r4,  =rt_interrupt_from_thread
+    ldr     r5,  [r4]
+    str     sp,  [r5]       @ store sp in preempted tasks's TCB
+
+    ldr     r6,  =rt_interrupt_to_thread
+    ldr     r6,  [r6]
+    ldr     sp,  [r6]       @ get new task's stack pointer
+
+    ldmfd   sp!, {r4}       @ pop new task's cpsr to spsr
+    msr     spsr_cxsf, r4
+
+    ldmfd   sp!, {r0-r12,lr,pc}^ @ pop new task's r0-r12,lr & pc, copy spsr to cpsr
+
+.macro push_svc_reg
+    sub     sp, sp, #17 * 4         @/* Sizeof(struct rt_hw_exp_stack)  */
+    stmia   sp, {r0 - r12}          @/* Calling r0-r12                  */
+    mov     r0, sp
+    mrs     r6, spsr                @/* Save CPSR                       */
+    str     lr, [r0, #15*4]         @/* Push PC                         */
+    str     r6, [r0, #16*4]         @/* Push CPSR                       */
+    cps     #Mode_SVC
+    str     sp, [r0, #13*4]         @/* Save calling SP                 */
+    str     lr, [r0, #14*4]         @/* Save calling PC                 */
+.endm
+
+    .align  5
+    .globl  vector_swi
+vector_swi:
+    push_svc_reg
+    bl      rt_hw_trap_swi
+    b       .
+
+    .align  5
+    .globl  vector_undef
+vector_undef:
+    push_svc_reg
+    bl      rt_hw_trap_undef
+    b       .
+
+    .align  5
+    .globl  vector_pabt
+vector_pabt:
+    push_svc_reg
+    bl      rt_hw_trap_pabt
+    b       .
+
+    .align  5
+    .globl  vector_dabt
+vector_dabt:
+    push_svc_reg
+    bl      rt_hw_trap_dabt
+    b       .
+
+    .align  5
+    .globl  vector_resv
+vector_resv:
+    push_svc_reg
+    bl      rt_hw_trap_resv
+    b       .

bsp/raspberry-pi/raspi2/cpu/trap.c

@@ -0,0 +1,183 @@
+/*
+ * File      : trap.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013, RT-Thread Develop Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2013-07-20     Bernard      first version
+ */
+
+#include <rthw.h>
+#include <board.h>
+#include <rtthread.h>
+
+#include "armv7.h"
+
+extern struct rt_thread *rt_current_thread;
+#ifdef RT_USING_FINSH
+extern long list_thread(void);
+#endif
+
+/**
+ * this function will show registers of CPU
+ *
+ * @param regs the registers point
+ */
+void rt_hw_show_register(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("Execption:\n");
+    rt_kprintf("r00:0x%08x r01:0x%08x r02:0x%08x r03:0x%08x\n", regs->r0, regs->r1, regs->r2, regs->r3);
+    rt_kprintf("r04:0x%08x r05:0x%08x r06:0x%08x r07:0x%08x\n", regs->r4, regs->r5, regs->r6, regs->r7);
+    rt_kprintf("r08:0x%08x r09:0x%08x r10:0x%08x\n", regs->r8, regs->r9, regs->r10);
+    rt_kprintf("fp :0x%08x ip :0x%08x\n", regs->fp, regs->ip);
+    rt_kprintf("sp :0x%08x lr :0x%08x pc :0x%08x\n", regs->sp, regs->lr, regs->pc);
+    rt_kprintf("cpsr:0x%08x\n", regs->cpsr);
+}
+
+/**
+ * When comes across an instruction which it cannot handle,
+ * it takes the undefined instruction trap.
+ *
+ * @param regs system registers
+ *
+ * @note never invoke this function in application
+ */
+void rt_hw_trap_undef(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("undefined instruction:\n");
+    rt_hw_show_register(regs);
+#ifdef RT_USING_FINSH
+    list_thread();
+#endif
+    rt_hw_cpu_shutdown();
+}
+
+/**
+ * The software interrupt instruction (SWI) is used for entering
+ * Supervisor mode, usually to request a particular supervisor
+ * function.
+ *
+ * @param regs system registers
+ *
+ * @note never invoke this function in application
+ */
+void rt_hw_trap_swi(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("software interrupt:\n");
+    rt_hw_show_register(regs);
+#ifdef RT_USING_FINSH
+    list_thread();
+#endif
+    rt_hw_cpu_shutdown();
+}
+
+/**
+ * An abort indicates that the current memory access cannot be completed,
+ * which occurs during an instruction prefetch.
+ *
+ * @param regs system registers
+ *
+ * @note never invoke this function in application
+ */
+void rt_hw_trap_pabt(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("prefetch abort:\n");
+    rt_hw_show_register(regs);
+#ifdef RT_USING_FINSH
+    list_thread();
+#endif
+    rt_hw_cpu_shutdown();
+}
+
+/**
+ * An abort indicates that the current memory access cannot be completed,
+ * which occurs during a data access.
+ *
+ * @param regs system registers
+ *
+ * @note never invoke this function in application
+ */
+void rt_hw_trap_dabt(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("data abort:");
+    rt_hw_show_register(regs);
+#ifdef RT_USING_FINSH
+    list_thread();
+#endif
+    rt_hw_cpu_shutdown();
+}
+
+/**
+ * Normally, system will never reach here
+ *
+ * @param regs system registers
+ *
+ * @note never invoke this function in application
+ */
+void rt_hw_trap_resv(struct rt_hw_exp_stack *regs)
+{
+    rt_kprintf("reserved trap:\n");
+    rt_hw_show_register(regs);
+#ifdef RT_USING_FINSH
+    list_thread();
+#endif
+    rt_hw_cpu_shutdown();
+}
+
+void rt_hw_trap_irq(void)
+{
+    void *param;
+    rt_isr_handler_t isr_func;
+    extern struct rt_irq_desc isr_table[];
+
+    uint32_t value = 0;
+
+    // rt_kprintf("pend basic: 0x%08x\n", IRQ_PEND_BASIC);
+    // rt_kprintf("     pend1: 0x%08x\n", IRQ_PEND1);
+    // rt_kprintf("     pend2: 0x%08x\n", IRQ_PEND2);
+
+    value = IRQ_PEND_BASIC & 0x3ff;
+    if (value)
+    {
+        uint32_t irq;
+
+        if (value & (1 << 8))
+        {
+            value = IRQ_PEND1;
+            irq = __rt_ffs(value) - 1;
+        }
+        else if (value & (1 << 9))
+        {
+            value = IRQ_PEND2;
+            irq = __rt_ffs(value) + 31;
+        }
+        else
+        {
+            value &= 0x0f;
+            irq = __rt_ffs(value) - 1;
+        }
+
+        /* get interrupt service routine */
+        isr_func = isr_table[irq].handler;
+#ifdef RT_USING_INTERRUPT_INFO
+        isr_table[irq].counter++;
+#endif
+        if (isr_func)
+        {
+            /* Interrupt for myself. */
+            param = isr_table[irq].param;
+            /* turn to interrupt service routine */
+            isr_func(irq, param);
+        }
+    }
+}
+
+void rt_hw_trap_fiq(void)
+{
+    /* TODO */
+}

bsp/raspberry-pi/raspi2/cpu/vector_gcc.S

@@ -0,0 +1,65 @@
+/*
+ * File      : vector_gcc.S
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2013-07-05     Bernard      the first version
+ */
+
+.section .vectors, "ax"
+.code 32
+
+.globl system_vectors
+system_vectors:
+    ldr pc, _vector_reset
+    ldr pc, _vector_undef
+    ldr pc, _vector_swi
+    ldr pc, _vector_pabt
+    ldr pc, _vector_dabt
+    ldr pc, _vector_resv
+    ldr pc, _vector_irq
+    ldr pc, _vector_fiq
+
+.globl _reset
+.globl vector_undef
+.globl vector_swi
+.globl vector_pabt
+.globl vector_dabt
+.globl vector_resv
+.globl vector_irq
+.globl vector_fiq
+
+_vector_reset:
+    .word _reset
+_vector_undef:
+    .word vector_undef
+_vector_swi:
+    .word vector_swi
+_vector_pabt:
+    .word vector_pabt
+_vector_dabt:
+    .word vector_dabt
+_vector_resv:
+    .word vector_resv
+_vector_irq:
+    .word vector_irq
+_vector_fiq:
+    .word vector_fiq
+
+.balignl    16,0xdeadbeef