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x86: zboot: Move kernel-version code into a function 

To help reduce the size and complexity of load_zimage(), move the code
that reads the kernel version into a separate function. Update
get_boot_protocol() to allow printing the 'Magic signature' message only
once, under control of its callers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-09-05 14:50:40 -06:00 committed by Bin Meng
parent 30b372d419
commit c038f3be3b
1 changed files with 27 additions and 16 deletions
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39
arch/x86/lib/zimage.c
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@ -103,13 +103,15 @@ static int kernel_magic_ok(struct setup_header *hdr)
}
}
static int get_boot_protocol(struct setup_header *hdr)
static int get_boot_protocol(struct setup_header *hdr, bool verbose)
{
if (hdr->header == KERNEL_V2_MAGIC) {
if (verbose)
printf("Magic signature found\n");
return hdr->version;
} else {
/* Very old kernel */
if (verbose)
printf("Magic signature not found\n");
return 0x0100;
}
@ -117,7 +119,7 @@ static int get_boot_protocol(struct setup_header *hdr)
static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
{
int bootproto = get_boot_protocol(hdr);
int bootproto = get_boot_protocol(hdr, false);
struct setup_data *sd;
int size;
@ -147,10 +149,24 @@ static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
return 0;
}
static const char *get_kernel_version(struct boot_params *params,
void *kernel_base)
{
struct setup_header *hdr = &params->hdr;
int bootproto;
bootproto = get_boot_protocol(hdr, false);
if (bootproto < 0x0200 || hdr->setup_sects < 15)
return NULL;
return kernel_base + hdr->kernel_version + 0x200;
}
struct boot_params *load_zimage(char *image, unsigned long kernel_size,
ulong *load_addressp)
{
struct boot_params *setup_base;
const char *version;
int setup_size;
int bootproto;
int big_image;
@ -178,21 +194,16 @@ struct boot_params *load_zimage(char *image, unsigned long kernel_size,
printf("Error: Setup is too large (%d bytes)\n", setup_size);
/* determine boot protocol version */
bootproto = get_boot_protocol(hdr);
bootproto = get_boot_protocol(hdr, true);
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");
}
}
version = get_kernel_version(params, image);
if (version)
printf("Linux kernel version %s\n", version);
else
printf("Setup Sectors < 15 - Cannot print kernel version\n");
/* Determine image type */
big_image = (bootproto >= 0x0200) &&
@ -261,7 +272,7 @@ 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);
int bootproto = get_boot_protocol(hdr, false);
setup_base->e820_entries = install_e820_map(
ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);