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Initrd support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-11-29 03:24:11 +01:00
parent 368a0c61fd
commit 96c210daa3
1 changed files with 70 additions and 18 deletions
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88
loader/mips/linux.c
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@ -34,13 +34,14 @@ static grub_dl_t my_mod;
static int loaded;
static grub_size_t initrd_size;
static grub_size_t linux_size;
static grub_uint8_t *playground;
static grub_addr_t target_addr, entry_addr, initrd_addr;
static grub_addr_t target_addr, entry_addr;
static int linux_argc;
static grub_addr_t argv_addr, envp_addr;
static grub_off_t argv_off, envp_off;
static grub_off_t rd_addr_arg_off, rd_size_arg_off;
static int initrd_loaded = 0;
static grub_err_t
grub_linux_boot (void)
@ -50,8 +51,8 @@ grub_linux_boot (void)
/* Boot the kernel. */
state.gpr[1] = entry_addr;
state.gpr[4] = linux_argc;
state.gpr[5] = argv_addr;
state.gpr[6] = envp_addr;
state.gpr[5] = target_addr + argv_off;
state.gpr[6] = target_addr + envp_off;
state.jumpreg = 1;
grub_relocator32_boot (playground, target_addr, state);
@ -198,10 +199,23 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
/* For arguments. */
linux_argc = argc;
/* Main arguments. */
size = (linux_argc + 1) * sizeof (grub_uint32_t);
size += ALIGN_UP (sizeof ("g"), 4);
/* Initrd address and size. */
size += 2 * sizeof (grub_uint32_t);
/* NULL terminator. */
size += sizeof (grub_uint32_t);
/* First arguments are always "a0" and "a1". */
size += ALIGN_UP (sizeof ("a0"), 4);
size += ALIGN_UP (sizeof ("a1"), 4);
/* Normal arguments. */
for (i = 1; i < argc; i++)
size += ALIGN_UP (grub_strlen (argv[i]) + 1, 4);
/* rd arguments. */
size += ALIGN_UP (sizeof ("rd_start=0xXXXXXXXXXXXXXXXX"), 4);
size += ALIGN_UP (sizeof ("rd_size=0xXXXXXXXXXXXXXXXX"), 4);
/* For the environment. */
size += sizeof (grub_uint32_t);
@ -220,15 +234,21 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
return err;
linux_argv = extra;
argv_addr = (grub_uint8_t *) linux_argv - (grub_uint8_t *) playground
+ target_addr;
extra = linux_argv + (linux_argc + 1);
argv_off = (grub_uint8_t *) linux_argv - (grub_uint8_t *) playground;
extra = linux_argv + (linux_argc + 1 + 1 + 2);
linux_args = extra;
grub_memcpy (linux_args, "g", sizeof ("g"));
grub_memcpy (linux_args, "a0", sizeof ("a0"));
*linux_argv = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground
+ target_addr;
linux_argv++;
linux_args += ALIGN_UP (sizeof ("g"), 4);
linux_args += ALIGN_UP (sizeof ("a0"), 4);
grub_memcpy (linux_args, "a1", sizeof ("a1"));
*linux_argv = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground
+ target_addr;
linux_argv++;
linux_args += ALIGN_UP (sizeof ("a1"), 4);
for (i = 1; i < argc; i++)
{
@ -238,16 +258,28 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
linux_argv++;
linux_args += ALIGN_UP (grub_strlen (argv[i]) + 1, 4);
}
/* Reserve space for rd arguments. */
rd_addr_arg_off = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground;
linux_args += ALIGN_UP (sizeof ("rd_start=0xXXXXXXXXXXXXXXXX"), 4);
*linux_argv = 0;
linux_argv++;
rd_size_arg_off = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground;
linux_args += ALIGN_UP (sizeof ("rd_size=0xXXXXXXXXXXXXXXXX"), 4);
*linux_argv = 0;
linux_argv++;
*linux_argv = 0;
extra = linux_args;
linux_envp = extra;
envp_addr = (grub_uint8_t *) linux_envp - (grub_uint8_t *) playground
+ target_addr;
envp_off = (grub_uint8_t *) linux_envp - (grub_uint8_t *) playground;
linux_envp[0] = 0;
grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
initrd_addr = 0;
initrd_loaded = 0;
loaded = 1;
grub_dl_ref (my_mod);
@ -260,6 +292,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
{
grub_file_t file = 0;
grub_ssize_t size;
grub_size_t overhead;
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified");
@ -267,20 +300,28 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
if (!loaded)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "You need to load the kernel first.");
if (initrd_loaded)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Only one initrd can be loaded.");
file = grub_file_open (argv[0]);
if (! file)
return grub_errno;
size = grub_file_size (file);
playground = grub_relocator32_realloc (playground, linux_size + size);
overhead = ALIGN_UP (target_addr + linux_size + 0x10000, 0x10000)
- (target_addr + linux_size);
playground = grub_relocator32_realloc (playground,
linux_size + overhead + size);
if (!playground)
{
grub_file_close (file);
return grub_errno;
}
if (grub_file_read (file, playground + linux_size, size) != size)
if (grub_file_read (file, playground + linux_size + overhead, size) != size)
{
grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
grub_file_close (file);
@ -288,8 +329,19 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
return grub_errno;
}
initrd_addr = target_addr + linux_size;
initrd_size = size;
grub_sprintf ((char *) playground + rd_addr_arg_off, "rd_start=0x%llx",
(unsigned long long) target_addr + linux_size + overhead);
((grub_uint32_t *) (playground + argv_off))[linux_argc]
= target_addr + rd_addr_arg_off;
linux_argc++;
grub_sprintf ((char *) playground + rd_size_arg_off, "rd_size=0x%llx",
(unsigned long long) size);
((grub_uint32_t *) (playground + argv_off))[linux_argc]
= target_addr + rd_size_arg_off;
linux_argc++;
initrd_loaded = 1;
grub_file_close (file);