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Get machine ID, boot device, preloaded kernel parameters and UUID from Qemu

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configuration device and NVRAM.


git-svn-id: svn://coreboot.org/openbios/openbios-devel@315 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Blue Swirl
2008-12-23 11:57:36 +00:00
parent 882edb55de
commit 18cd147df3
2 changed files with 120 additions and 1 deletions
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52
arch/ppc/qemu/main.c
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@@ -33,6 +33,10 @@ do { printk("ELF - %s: " fmt, __func__ , ##args); } while (0)
#define ELF_DPRINTF(fmt, args...) do { } while (0)
#endif
#define NVRAM_ADDR_LO 0x74
#define NVRAM_ADDR_HI 0x75
#define NVRAM_DATA 0x77
static void
transfer_control_to_elf( ulong elf_entry )
{
@@ -206,6 +210,24 @@ try_bootinfo(const char *path)
close_io( fd );
}
static uint8_t nvram_read(uint16_t offset)
{
outb(offset & 0xff, NVRAM_ADDR_LO);
outb(offset >> 8, NVRAM_ADDR_HI);
return inb(NVRAM_DATA);
}
static uint32_t nvram_read_be32(uint16_t offset)
{
uint32_t ret;
ret = nvram_read(offset) << 24;
ret |= nvram_read(offset + 1) << 16;
ret |= nvram_read(offset + 2) << 8;
ret |= nvram_read(offset + 3);
return ret;
}
static void
yaboot_startup( void )
{
@@ -238,6 +260,19 @@ yaboot_startup( void )
}
try_bootinfo(path);
try_path(path, param);
} else {
char boot_device = nvram_read(0x34);
switch (boot_device) {
case 'c':
path = strdup("hd:0");
break;
default:
case 'd':
path = strdup("cdrom:0");
break;
}
try_bootinfo(path);
}
} else {
ELF_DPRINTF("Entering boot, path %s\n", path);
@@ -250,6 +285,22 @@ yaboot_startup( void )
printk("*** Boot failure! No secondary bootloader specified ***\n");
}
static void check_preloaded_kernel(void)
{
unsigned long kernel_image, kernel_size, cmdline;
unsigned long initrd_image, initrd_size;
kernel_size = nvram_read_be32(0x3c);
if (kernel_size) {
kernel_image = nvram_read_be32(0x38);
cmdline = nvram_read_be32(0x40);
initrd_image = nvram_read_be32(0x48);
initrd_size = nvram_read_be32(0x4c);
printk("[ppc] Kernel already loaded (0x%8.8lx + 0x%8.8lx)\n",
kernel_image, kernel_size);
call_elf(kernel_image);
}
}
/************************************************************************/
/* entry */
@@ -259,5 +310,6 @@ void
boot( void )
{
fword("update-chosen");
check_preloaded_kernel();
yaboot_startup();
}