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/*
* (C) Copyright 2008 - 2013 Tensilica Inc.
* (C) Copyright 2014 Cadence Design Systems Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>
#include <asm/bootparam.h>
#include <asm/cache.h>
#include <image.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Setup boot-parameters.
*/
static struct bp_tag *setup_first_tag(struct bp_tag *params)
{
params->id = BP_TAG_FIRST;
params->size = sizeof(long);
*(unsigned long *)¶ms->data = BP_VERSION;
return bp_tag_next(params);
}
static struct bp_tag *setup_last_tag(struct bp_tag *params)
{
params->id = BP_TAG_LAST;
params->size = 0;
return bp_tag_next(params);
}
static struct bp_tag *setup_memory_tag(struct bp_tag *params)
{
struct bd_info *bd = gd->bd;
struct meminfo *mem;
params->id = BP_TAG_MEMORY;
params->size = sizeof(struct meminfo);
mem = (struct meminfo *)params->data;
mem->type = MEMORY_TYPE_CONVENTIONAL;
mem->start = bd->bi_memstart;
mem->end = bd->bi_memstart + bd->bi_memsize;
printf(" MEMORY: tag:0x%04x, type:0X%lx, start:0X%lx, end:0X%lx\n",
BP_TAG_MEMORY, mem->type, mem->start, mem->end);
return bp_tag_next(params);
}
static struct bp_tag *setup_commandline_tag(struct bp_tag *params,
char *cmdline)
{
int len;
if (!cmdline)
return params;
len = strlen(cmdline);
params->id = BP_TAG_COMMAND_LINE;
params->size = (len + 3) & -4;
strcpy((char *)params->data, cmdline);
printf(" COMMAND_LINE: tag:0x%04x, size:%u, data:'%s'\n",
BP_TAG_COMMAND_LINE, params->size, cmdline);
return bp_tag_next(params);
}
static struct bp_tag *setup_ramdisk_tag(struct bp_tag *params,
unsigned long rd_start,
unsigned long rd_end)
{
struct meminfo *mem;
if (rd_start == rd_end)
return params;
/* Add a single banked memory */
params->id = BP_TAG_INITRD;
params->size = sizeof(struct meminfo);
mem = (struct meminfo *)params->data;
mem->type = MEMORY_TYPE_CONVENTIONAL;
mem->start = PHYSADDR(rd_start);
mem->end = PHYSADDR(rd_end);
printf(" INITRD: tag:0x%x, type:0X%04lx, start:0X%lx, end:0X%lx\n",
BP_TAG_INITRD, mem->type, mem->start, mem->end);
return bp_tag_next(params);
}
static struct bp_tag *setup_serial_tag(struct bp_tag *params)
{
params->id = BP_TAG_SERIAL_BAUDRATE;
params->size = sizeof(unsigned long);
params->data[0] = gd->baudrate;
printf(" SERIAL_BAUDRATE: tag:0x%04x, size:%u, baudrate:%lu\n",
BP_TAG_SERIAL_BAUDRATE, params->size, params->data[0]);
return bp_tag_next(params);
}
#ifdef CONFIG_OF_LIBFDT
static struct bp_tag *setup_fdt_tag(struct bp_tag *params, void *fdt_start)
{
params->id = BP_TAG_FDT;
params->size = sizeof(unsigned long);
params->data[0] = (unsigned long)fdt_start;
printf(" FDT: tag:0x%04x, size:%u, start:0x%lx\n",
BP_TAG_FDT, params->size, params->data[0]);
return bp_tag_next(params);
}
#endif
/*
* Boot Linux.
*/
int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
{
struct bp_tag *params, *params_start;
ulong initrd_start, initrd_end;
char *commandline = getenv("bootargs");
if (!(flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)))
return 0;
show_boot_progress(15);
if (images->rd_start) {
initrd_start = images->rd_start;
initrd_end = images->rd_end;
} else {
initrd_start = 0;
initrd_end = 0;
}
params_start = (struct bp_tag *)gd->bd->bi_boot_params;
params = params_start;
params = setup_first_tag(params);
params = setup_memory_tag(params);
params = setup_commandline_tag(params, commandline);
params = setup_serial_tag(params);
if (initrd_start)
params = setup_ramdisk_tag(params, initrd_start, initrd_end);
#ifdef CONFIG_OF_LIBFDT
if (images->ft_addr)
params = setup_fdt_tag(params, images->ft_addr);
#endif
printf("\n");
params = setup_last_tag(params);
show_boot_progress(15);
printf("Transferring Control to Linux @0x%08lx ...\n\n",
(ulong)images->ep);
flush_dcache_range((unsigned long)params_start, (unsigned long)params);
if (flag & BOOTM_STATE_OS_FAKE_GO)
return 0;
/*
* _start() in vmlinux expects boot params in register a2.
* NOTE:
* Disable/delete your u-boot breakpoints before stepping into linux.
*/
asm volatile ("mov a2, %0\n\t"
"jx %1\n\t"
: : "a" (params_start), "a" (images->ep)
: "a2");
/* Does not return */
return 1;
}
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