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xtensa_lx60: pass kernel arguments from -append 

Create boot parameters in the end of SRAM region, insert kernel
arguments specified in -append there.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2011-10-30 21:24:26 +04:00
parent 82b25dc8b0
commit 292627bb5e
2 changed files with 45 additions and 4 deletions
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25
hw/xtensa_bootparam.h Normal file
View File

@ -0,0 +1,25 @@
#ifndef HW_XTENSA_BOOTPARAM
#define HW_XTENSA_BOOTPARAM
typedef struct BpTag {
uint16_t tag;
uint16_t size;
} BpTag;
static inline ram_addr_t put_tag(ram_addr_t addr, uint16_t tag,
size_t size, const void *data)
{
BpTag bp_tag = {
.tag = tswap16(tag),
.size = tswap16((size + 3) & ~3),
};
cpu_physical_memory_write(addr, &bp_tag, sizeof(bp_tag));
addr += sizeof(bp_tag);
cpu_physical_memory_write(addr, data, size);
addr += (size + 3) & ~3;
return addr;
}
#endif

24
hw/xtensa_lx60.c
View File

@ -34,6 +34,7 @@
#include "pc.h"
#include "sysbus.h"
#include "flash.h"
#include "xtensa_bootparam.h"
typedef struct LxBoardDesc {
size_t flash_size;
@ -188,10 +189,6 @@ static void lx_init(const LxBoardDesc *board,
memory_region_init_ram(ram, NULL, "xtensa.sram", ram_size);
memory_region_add_subregion(system_memory, 0, ram);
rom = g_malloc(sizeof(*rom));
memory_region_init_ram(rom, NULL, "xtensa.rom", 0x1000);
memory_region_add_subregion(system_memory, 0xfe000000, rom);
system_io = g_malloc(sizeof(*system_io));
memory_region_init(system_io, "system.io", 224 * 1024 * 1024);
memory_region_add_subregion(system_memory, 0xf0000000, system_io);
@ -223,6 +220,25 @@ static void lx_init(const LxBoardDesc *board,
/* Use presence of kernel file name as 'boot from SRAM' switch. */
if (kernel_filename) {
rom = g_malloc(sizeof(*rom));
memory_region_init_ram(rom, NULL, "lx60.sram", board->sram_size);
memory_region_add_subregion(system_memory, 0xfe000000, rom);
/* Put kernel bootparameters to the end of that SRAM */
if (kernel_cmdline) {
size_t cmdline_size = strlen(kernel_cmdline) + 1;
size_t bp_size = sizeof(BpTag[4]) + cmdline_size;
uint32_t tagptr = (0xfe000000 + board->sram_size - bp_size) & ~0xff;
env->regs[2] = tagptr;
tagptr = put_tag(tagptr, 0x7b0b, 0, NULL);
if (cmdline_size > 1) {
tagptr = put_tag(tagptr, 0x1001,
cmdline_size, kernel_cmdline);
}
tagptr = put_tag(tagptr, 0x7e0b, 0, NULL);
}
uint64_t elf_entry;
uint64_t elf_lowaddr;
int success = load_elf(kernel_filename, translate_phys_addr, env,