source: mainline/boot/arch/arm32/src/main.c@ b1011dae

/*
 * Copyright (c) 2007 Michal Kebrt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup arm32boot
 * @{
 */
/** @file
 * @brief Bootstrap.
 */

#include <arch/main.h>
#include <arch/asm.h>
#include <arch/mm.h>
#include <arch/_components.h>
#include <halt.h>
#include <printf.h>
#include <memstr.h>
#include <version.h>
#include <macros.h>
#include <align.h>
#include <str.h>
#include <errno.h>
#include <inflate.h>

#define TOP2ADDR(top)  (((void *) PA2KA(BOOT_OFFSET)) + (top))

extern void *bdata_start;
extern void *bdata_end;


static inline void invalidate_icache(void)
{
        /* ICIALLU Invalidate entire ICache */
        asm volatile ("mov r0, #0\n" "mcr p15, 0, r0, c7, c5, 0\n" ::: "r0" );
}

static inline void invalidate_dcache(void *address, size_t size)
{
        const uintptr_t addr = (uintptr_t)address;
        /* DCIMVAC - invalidate by address to the point of coherence */
        for (uintptr_t a = addr; a < addr + size; a += 4) {
                asm volatile ("mcr p15, 0, %[a], c7, c6, 1\n" :: [a]"r"(a) : );
        }
}

static inline void clean_dcache_poc(void *address, size_t size)
{
        const uintptr_t addr = (uintptr_t)address;
        /* DCCMVAC - clean by address to the point of coherence */
        for (uintptr_t a = addr; a < addr + size; a += 4) {
                asm volatile ("mcr p15, 0, %[a], c7, c10, 1\n" :: [a]"r"(a) : );
        }
}

static bootinfo_t bootinfo;

void bootstrap(void)
{
        /* Make sure  we run in memory code when caches are enabled,
         * make sure we read memory data too. This part is ARMv7 specific as
         * ARMv7 no longer invalidates caches on restart.
         * See chapter B2.2.2 of ARM Architecture Reference Manual p. B2-1263*/
        invalidate_icache();
        invalidate_dcache(&bdata_start, &bdata_end - &bdata_start);

        /* Enable MMU and caches */
        mmu_start();
        version_print();
        
        printf("Boot data: %p -> %p\n", &bdata_start, &bdata_end);
        printf("\nMemory statistics\n");
        printf(" %p|%p: bootstrap stack\n", &boot_stack, &boot_stack);
        printf(" %p|%p: bootstrap page table\n", &boot_pt, &boot_pt);
        printf(" %p|%p: boot info structure\n", &bootinfo, &bootinfo);
        printf(" %p|%p: kernel entry point\n",
            (void *) PA2KA(BOOT_OFFSET), (void *) BOOT_OFFSET);
        
        for (size_t i = 0; i < COMPONENTS; i++) {
                printf(" %p|%p: %s image (%u/%u bytes)\n", components[i].start,
                    components[i].start, components[i].name, components[i].inflated,
                    components[i].size);
                invalidate_dcache(components[i].start, components[i].size);
        }
        
        void *dest[COMPONENTS];
        size_t top = 0;
        size_t cnt = 0;
        bootinfo.cnt = 0;
        for (size_t i = 0; i < min(COMPONENTS, TASKMAP_MAX_RECORDS); i++) {
                top = ALIGN_UP(top, PAGE_SIZE);
                
                if (i > 0) {
                        bootinfo.tasks[bootinfo.cnt].addr = TOP2ADDR(top);
                        bootinfo.tasks[bootinfo.cnt].size = components[i].inflated;
                        
                        str_cpy(bootinfo.tasks[bootinfo.cnt].name,
                            BOOTINFO_TASK_NAME_BUFLEN, components[i].name);
                        
                        bootinfo.cnt++;
                }
                
                dest[i] = TOP2ADDR(top);
                top += components[i].inflated;
                cnt++;
        }
        
        printf("\nInflating components ... ");
        
        for (size_t i = cnt; i > 0; i--) {
                void *tail = components[i - 1].start + components[i - 1].size;
                if (tail >= dest[i - 1]) {
                        printf("\n%s: Image too large to fit (%p >= %p), halting.\n",
                            components[i].name, tail, dest[i - 1]);
                        halt();
                }
                
                printf("%s ", components[i - 1].name);
                
                int err = inflate(components[i - 1].start, components[i - 1].size,
                    dest[i - 1], components[i - 1].inflated);
                if (err != EOK) {
                        printf("\n%s: Inflating error %d\n", components[i - 1].name, err);
                        halt();
                }
                clean_dcache_poc(dest[i - 1], components[i - 1].inflated);
        }
        
        printf(".\n");
        
        void *kernel_end = (void *) PA2KA(BOOT_OFFSET + components[0].inflated);
        printf("Booting the kernel...\n");
        jump_to_kernel((void *) PA2KA(BOOT_OFFSET), &bootinfo);
}

/** @}
 */