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Diffstat (limited to 'arch/x86/lib/zimage.c')
-rw-r--r--arch/x86/lib/zimage.c183
1 files changed, 103 insertions, 80 deletions
diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index b5597ec..0cbb571 100644
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -89,21 +89,8 @@ static void build_command_line(char *command_line, int auto_boot)
printf("Kernel command line: \"%s\"\n", command_line);
}
-void *load_zimage(char *image, unsigned long kernel_size,
- unsigned long initrd_addr, unsigned long initrd_size,
- int auto_boot, void **load_address)
+static int kernel_magic_ok(struct setup_header *hdr)
{
- struct boot_params *setup_base;
- int setup_size;
- int bootproto;
- int big_image;
-
- struct boot_params *params = (struct boot_params *)image;
- struct setup_header *hdr = &params->hdr;
-
- /* base address for real-mode segment */
- setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
-
if (KERNEL_MAGIC != hdr->boot_flag) {
printf("Error: Invalid Boot Flag "
"(found 0x%04x, expected 0x%04x)\n",
@@ -111,18 +98,38 @@ void *load_zimage(char *image, unsigned long kernel_size,
return 0;
} else {
printf("Valid Boot Flag\n");
+ return 1;
}
+}
- /* determine boot protocol version */
- if (KERNEL_V2_MAGIC == hdr->header) {
+static int get_boot_protocol(struct setup_header *hdr)
+{
+ if (hdr->header == KERNEL_V2_MAGIC) {
printf("Magic signature found\n");
-
- bootproto = hdr->version;
+ return hdr->version;
} else {
/* Very old kernel */
printf("Magic signature not found\n");
- bootproto = 0x0100;
+ return 0x0100;
}
+}
+
+struct boot_params *load_zimage(char *image, unsigned long kernel_size,
+ void **load_address)
+{
+ struct boot_params *setup_base;
+ int setup_size;
+ int bootproto;
+ int big_image;
+
+ struct boot_params *params = (struct boot_params *)image;
+ struct setup_header *hdr = &params->hdr;
+
+ /* base address for real-mode segment */
+ setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
+
+ if (!kernel_magic_ok(hdr))
+ return 0;
/* determine size of setup */
if (0 == hdr->setup_sects) {
@@ -137,6 +144,23 @@ void *load_zimage(char *image, unsigned long kernel_size,
if (setup_size > SETUP_MAX_SIZE)
printf("Error: Setup is too large (%d bytes)\n", setup_size);
+ /* determine boot protocol version */
+ bootproto = get_boot_protocol(hdr);
+
+ printf("Using boot protocol version %x.%02x\n",
+ (bootproto & 0xff00) >> 8, bootproto & 0xff);
+
+ if (bootproto >= 0x0200) {
+ if (hdr->setup_sects >= 15) {
+ printf("Linux kernel version %s\n",
+ (char *)params +
+ hdr->kernel_version + 0x200);
+ } else {
+ printf("Setup Sectors < 15 - "
+ "Cannot print kernel version.\n");
+ }
+ }
+
/* Determine image type */
big_image = (bootproto >= 0x0200) &&
(hdr->loadflags & BIG_KERNEL_FLAG);
@@ -151,9 +175,6 @@ void *load_zimage(char *image, unsigned long kernel_size,
printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
memset(setup_base, 0, sizeof(*setup_base));
setup_base->hdr = params->hdr;
-
- setup_base->e820_entries = install_e820_map(
- ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
#else
/* load setup */
printf("Moving Real-Mode Code to 0x%8.8lx (%d bytes)\n",
@@ -161,13 +182,12 @@ void *load_zimage(char *image, unsigned long kernel_size,
memmove(setup_base, image, setup_size);
#endif
- printf("Using boot protocol version %x.%02x\n",
- (bootproto & 0xff00) >> 8, bootproto & 0xff);
+ if (bootproto >= 0x0204)
+ kernel_size = hdr->syssize * 16;
+ else
+ kernel_size -= setup_size;
if (bootproto == 0x0100) {
- setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
- setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
-
/*
* A very old kernel MUST have its real-mode code
* loaded at 0x90000
@@ -190,21 +210,45 @@ void *load_zimage(char *image, unsigned long kernel_size,
SETUP_MAX_SIZE - setup_size);
}
- /* We are now setting up the real-mode version of the header */
- hdr = &setup_base->hdr;
+ if (big_image) {
+ if (kernel_size > BZIMAGE_MAX_SIZE) {
+ printf("Error: bzImage kernel too big! "
+ "(size: %ld, max: %d)\n",
+ kernel_size, BZIMAGE_MAX_SIZE);
+ return 0;
+ }
+ } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
+ printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
+ kernel_size, ZIMAGE_MAX_SIZE);
+ return 0;
+ }
+
+ printf("Loading %s at address %p (%ld bytes)\n",
+ big_image ? "bzImage" : "zImage", *load_address, kernel_size);
+
+ memmove(*load_address, image + setup_size, kernel_size);
+
+ return setup_base;
+}
+
+int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
+ unsigned long initrd_addr, unsigned long initrd_size)
+{
+ struct setup_header *hdr = &setup_base->hdr;
+ int bootproto = get_boot_protocol(hdr);
+
+#if defined CONFIG_ZBOOT_32
+ setup_base->e820_entries = install_e820_map(
+ ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
+#endif
+ if (bootproto == 0x0100) {
+ setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
+ setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
+ }
if (bootproto >= 0x0200) {
hdr->type_of_loader = 8;
- if (hdr->setup_sects >= 15) {
- printf("Linux kernel version %s\n",
- (char *)params +
- hdr->kernel_version + 0x200);
- } else {
- printf("Setup Sectors < 15 - "
- "Cannot print kernel version.\n");
- }
-
if (initrd_addr) {
printf("Initial RAM disk at linear address "
"0x%08lx, size %ld bytes\n",
@@ -221,44 +265,18 @@ void *load_zimage(char *image, unsigned long kernel_size,
}
if (bootproto >= 0x0202) {
- hdr->cmd_line_ptr =
- (uintptr_t)setup_base + COMMAND_LINE_OFFSET;
+ hdr->cmd_line_ptr = (uintptr_t)cmd_line;
} else if (bootproto >= 0x0200) {
setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
- setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
+ setup_base->screen_info.cl_offset =
+ (uintptr_t)cmd_line - (uintptr_t)setup_base;
hdr->setup_move_size = 0x9100;
}
- if (bootproto >= 0x0204)
- kernel_size = hdr->syssize * 16;
- else
- kernel_size -= setup_size;
-
-
- if (big_image) {
- if ((kernel_size) > BZIMAGE_MAX_SIZE) {
- printf("Error: bzImage kernel too big! "
- "(size: %ld, max: %d)\n",
- kernel_size, BZIMAGE_MAX_SIZE);
- return 0;
- }
- } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
- printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
- kernel_size, ZIMAGE_MAX_SIZE);
- return 0;
- }
-
/* build command line at COMMAND_LINE_OFFSET */
- build_command_line((char *)setup_base + COMMAND_LINE_OFFSET, auto_boot);
-
- printf("Loading %czImage at address 0x%08x (%ld bytes)\n",
- big_image ? 'b' : ' ', (u32)*load_address, kernel_size);
-
- memmove(*load_address, image + setup_size, kernel_size);
-
- /* ready for booting */
- return setup_base;
+ build_command_line(cmd_line, auto_boot);
+ return 0;
}
void boot_zimage(void *setup_base, void *load_address)
@@ -298,7 +316,7 @@ void boot_zimage(void *setup_base, void *load_address)
int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
- void *base_ptr;
+ struct boot_params *base_ptr;
void *bzImage_addr = NULL;
void *load_address;
char *s;
@@ -324,20 +342,25 @@ int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
bzImage_size = simple_strtoul(argv[2], NULL, 16);
/* Lets look for */
- base_ptr = load_zimage(bzImage_addr, bzImage_size, 0, 0, 0,
- &load_address);
+ base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
if (!base_ptr) {
printf("## Kernel loading failed ...\n");
- } else {
- printf("## Transferring control to Linux "
- "(at address %08x) ...\n",
- (u32)base_ptr);
-
- /* we assume that the kernel is in place */
- boot_zimage(base_ptr, load_address);
- /* does not return */
+ return -1;
}
+ if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
+ 0, 0, 0)) {
+ printf("Setting up boot parameters failed ...\n");
+ return -1;
+ }
+
+ printf("## Transferring control to Linux "
+ "(at address %08x) ...\n",
+ (u32)base_ptr);
+
+ /* we assume that the kernel is in place */
+ boot_zimage(base_ptr, load_address);
+ /* does not return */
return -1;
}
generated by cgit v1.1 at 2024-11-27 13:03:26 +0000