u-boot/arch/arm/lib/bootm.c

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/* Copyright (C) 2011
* Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
* - Added prep subcommand support
* - Reorganized source - modeled after powerpc version
*
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* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
* SPDX-License-Identifier: GPL-2.0+
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*/
#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <asm/bootm.h>
#include <asm/secure.h>
#include <linux/compiler.h>
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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
#include <asm/armv7.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
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static struct tag *params;
static ulong get_sp(void)
{
ulong ret;
asm("mov %0, sp" : "=r"(ret) : );
return ret;
}
void arch_lmb_reserve(struct lmb *lmb)
{
ulong sp;
/*
* Booting a (Linux) kernel image
*
* Allocate space for command line and board info - the
* address should be as high as possible within the reach of
* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
* memory, which means far enough below the current stack
* pointer.
*/
sp = get_sp();
debug("## Current stack ends at 0x%08lx ", sp);
/* adjust sp by 4K to be safe */
sp -= 4096;
lmb_reserve(lmb, sp,
gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
}
/**
* announce_and_cleanup() - Print message and prepare for kernel boot
*
* @fake: non-zero to do everything except actually boot
*/
static void announce_and_cleanup(int fake)
{
printf("\nStarting kernel ...%s\n\n", fake ?
"(fake run for tracing)" : "");
bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
#ifdef CONFIG_BOOTSTAGE_FDT
bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
bootstage_report();
#endif
#ifdef CONFIG_USB_DEVICE
udc_disconnect();
#endif
cleanup_before_linux();
}
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static void setup_start_tag (bd_t *bd)
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{
params = (struct tag *)bd->bi_boot_params;
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params->hdr.tag = ATAG_CORE;
params->hdr.size = tag_size (tag_core);
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params->u.core.flags = 0;
params->u.core.pagesize = 0;
params->u.core.rootdev = 0;
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params = tag_next (params);
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}
static void setup_memory_tags(bd_t *bd)
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{
int i;
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
params->hdr.tag = ATAG_MEM;
params->hdr.size = tag_size (tag_mem32);
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params->u.mem.start = bd->bi_dram[i].start;
params->u.mem.size = bd->bi_dram[i].size;
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params = tag_next (params);
}
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}
static void setup_commandline_tag(bd_t *bd, char *commandline)
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{
char *p;
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if (!commandline)
return;
/* eat leading white space */
for (p = commandline; *p == ' '; p++);
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/* skip non-existent command lines so the kernel will still
* use its default command line.
*/
if (*p == '\0')
return;
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params->hdr.tag = ATAG_CMDLINE;
params->hdr.size =
(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
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strcpy (params->u.cmdline.cmdline, p);
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params = tag_next (params);
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}
static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
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{
/* an ATAG_INITRD node tells the kernel where the compressed
* ramdisk can be found. ATAG_RDIMG is a better name, actually.
*/
params->hdr.tag = ATAG_INITRD2;
params->hdr.size = tag_size (tag_initrd);
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params->u.initrd.start = initrd_start;
params->u.initrd.size = initrd_end - initrd_start;
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params = tag_next (params);
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}
static void setup_serial_tag(struct tag **tmp)
{
struct tag *params = *tmp;
struct tag_serialnr serialnr;
get_board_serial(&serialnr);
params->hdr.tag = ATAG_SERIAL;
params->hdr.size = tag_size (tag_serialnr);
params->u.serialnr.low = serialnr.low;
params->u.serialnr.high= serialnr.high;
params = tag_next (params);
*tmp = params;
}
static void setup_revision_tag(struct tag **in_params)
{
u32 rev = 0;
rev = get_board_rev();
params->hdr.tag = ATAG_REVISION;
params->hdr.size = tag_size (tag_revision);
params->u.revision.rev = rev;
params = tag_next (params);
}
static void setup_end_tag(bd_t *bd)
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{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
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}
__weak void setup_board_tags(struct tag **in_params) {}
#ifdef CONFIG_ARM64
static void do_nonsec_virt_switch(void)
{
smp_kick_all_cpus();
flush_dcache_all(); /* flush cache before swtiching to EL2 */
armv8_switch_to_el2();
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
armv8_switch_to_el1();
#endif
}
#endif
/* Subcommand: PREP */
static void boot_prep_linux(bootm_headers_t *images)
{
char *commandline = getenv("bootargs");
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
#ifdef CONFIG_OF_LIBFDT
debug("using: FDT\n");
if (image_setup_linux(images)) {
printf("FDT creation failed! hanging...");
hang();
}
#endif
} else if (BOOTM_ENABLE_TAGS) {
debug("using: ATAGS\n");
setup_start_tag(gd->bd);
if (BOOTM_ENABLE_SERIAL_TAG)
setup_serial_tag(&params);
if (BOOTM_ENABLE_CMDLINE_TAG)
setup_commandline_tag(gd->bd, commandline);
if (BOOTM_ENABLE_REVISION_TAG)
setup_revision_tag(&params);
if (BOOTM_ENABLE_MEMORY_TAGS)
setup_memory_tags(gd->bd);
if (BOOTM_ENABLE_INITRD_TAG) {
if (images->rd_start && images->rd_end) {
setup_initrd_tag(gd->bd, images->rd_start,
images->rd_end);
}
}
setup_board_tags(&params);
setup_end_tag(gd->bd);
} else {
printf("FDT and ATAGS support not compiled in - hanging\n");
hang();
}
}
/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
#ifdef CONFIG_ARM64
void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
void *res2);
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
void *res2))images->ep;
debug("## Transferring control to Linux (at address %lx)...\n",
(ulong) kernel_entry);
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
announce_and_cleanup(fake);
if (!fake) {
do_nonsec_virt_switch();
kernel_entry(images->ft_addr, NULL, NULL, NULL);
}
#else
unsigned long machid = gd->bd->bi_arch_number;
char *s;
void (*kernel_entry)(int zero, int arch, uint params);
unsigned long r2;
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
kernel_entry = (void (*)(int, int, uint))images->ep;
s = getenv("machid");
if (s) {
strict_strtoul(s, 16, &machid);
printf("Using machid 0x%lx from environment\n", machid);
}
debug("## Transferring control to Linux (at address %08lx)" \
"...\n", (ulong) kernel_entry);
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
announce_and_cleanup(fake);
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
r2 = (unsigned long)images->ft_addr;
else
r2 = gd->bd->bi_boot_params;
if (!fake) {
#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
armv7_init_nonsec();
secure_ram_addr(_do_nonsec_entry)(kernel_entry,
0, machid, r2);
#else
kernel_entry(0, machid, r2);
#endif
}
#endif
}
/* Main Entry point for arm bootm implementation
*
* Modeled after the powerpc implementation
* DIFFERENCE: Instead of calling prep and go at the end
* they are called if subcommand is equal 0.
*/
int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
{
/* No need for those on ARM */
if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
return -1;
if (flag & BOOTM_STATE_OS_PREP) {
boot_prep_linux(images);
return 0;
}
if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
boot_jump_linux(images, flag);
return 0;
}
boot_prep_linux(images);
boot_jump_linux(images, flag);
return 0;
}
#ifdef CONFIG_CMD_BOOTZ
struct zimage_header {
uint32_t code[9];
uint32_t zi_magic;
uint32_t zi_start;
uint32_t zi_end;
};
#define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818
int bootz_setup(ulong image, ulong *start, ulong *end)
{
struct zimage_header *zi;
zi = (struct zimage_header *)map_sysmem(image, 0);
if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
puts("Bad Linux ARM zImage magic!\n");
return 1;
}
*start = zi->zi_start;
*end = zi->zi_end;
printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
*end);
return 0;
}
#endif /* CONFIG_CMD_BOOTZ */
#if defined(CONFIG_BOOTM_VXWORKS)
void boot_prep_vxworks(bootm_headers_t *images)
{
#if defined(CONFIG_OF_LIBFDT)
int off;
if (images->ft_addr) {
off = fdt_path_offset(images->ft_addr, "/memory");
if (off < 0) {
if (arch_fixup_fdt(images->ft_addr))
puts("## WARNING: fixup memory failed!\n");
}
}
#endif
cleanup_before_linux();
}
void boot_jump_vxworks(bootm_headers_t *images)
{
/* ARM VxWorks requires device tree physical address to be passed */
((void (*)(void *))images->ep)(images->ft_addr);
}
#endif