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x86, efi; Add EFI boot stub console support
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We need a way of printing useful messages to the user, for example
when we fail to open an initrd file, instead of just hanging the
machine without giving the user any indication of what went wrong. So
sprinkle some error messages throughout the EFI boot stub code to make
it easier for users to diagnose/report problems.

Reported-by: Keshav P R <the.ridikulus.rat@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1331907517-3985-3-git-send-email-matt@console-pimps.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Matt Fleming authored and H. Peter Anvin committed Jun 1, 2012
1 parent 30dc0d0 commit 9fa7ded
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Showing 2 changed files with 75 additions and 16 deletions.
85 changes: 69 additions & 16 deletions arch/x86/boot/compressed/eboot.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,26 @@

static efi_system_table_t *sys_table;

static void efi_printk(char *str)
{
char *s8;

for (s8 = str; *s8; s8++) {
struct efi_simple_text_output_protocol *out;
efi_char16_t ch[2] = { 0 };

ch[0] = *s8;
out = (struct efi_simple_text_output_protocol *)sys_table->con_out;

if (*s8 == '\n') {
efi_char16_t nl[2] = { '\r', 0 };
efi_call_phys2(out->output_string, out, nl);
}

efi_call_phys2(out->output_string, out, ch);
}
}

static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
unsigned long *desc_size)
{
Expand Down Expand Up @@ -531,8 +551,10 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
EFI_LOADER_DATA,
nr_initrds * sizeof(*initrds),
&initrds);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for initrds\n");
goto fail;
}

str = (char *)(unsigned long)hdr->cmd_line_ptr;
for (i = 0; i < nr_initrds; i++) {
Expand Down Expand Up @@ -575,32 +597,42 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,

status = efi_call_phys3(boottime->handle_protocol,
image->device_handle, &fs_proto, &io);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to handle fs_proto\n");
goto free_initrds;
}

status = efi_call_phys2(io->open_volume, io, &fh);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to open volume\n");
goto free_initrds;
}
}

status = efi_call_phys5(fh->open, fh, &h, filename_16,
EFI_FILE_MODE_READ, (u64)0);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to open initrd file\n");
goto close_handles;
}

initrd->handle = h;

info_sz = 0;
status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, NULL);
if (status != EFI_BUFFER_TOO_SMALL)
if (status != EFI_BUFFER_TOO_SMALL) {
efi_printk("Failed to get initrd info size\n");
goto close_handles;
}

grow:
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, info_sz, &info);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for initrd info\n");
goto close_handles;
}

status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, info);
Expand All @@ -612,8 +644,10 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
file_sz = info->file_size;
efi_call_phys1(sys_table->boottime->free_pool, info);

if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to get initrd info\n");
goto close_handles;
}

initrd->size = file_sz;
initrd_total += file_sz;
Expand All @@ -629,11 +663,14 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
*/
status = high_alloc(initrd_total, 0x1000,
&initrd_addr, hdr->initrd_addr_max);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc highmem for initrds\n");
goto close_handles;
}

/* We've run out of free low memory. */
if (initrd_addr > hdr->initrd_addr_max) {
efi_printk("We've run out of free low memory\n");
status = EFI_INVALID_PARAMETER;
goto free_initrd_total;
}
Expand All @@ -652,8 +689,10 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
status = efi_call_phys3(fh->read,
initrds[j].handle,
&chunksize, addr);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to read initrd\n");
goto free_initrd_total;
}
addr += chunksize;
size -= chunksize;
}
Expand Down Expand Up @@ -732,8 +771,10 @@ static efi_status_t make_boot_params(struct boot_params *boot_params,
options_size++; /* NUL termination */

status = low_alloc(options_size, 1, &cmdline);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for cmdline\n");
goto fail;
}

s1 = (u8 *)(unsigned long)cmdline;
s2 = (u16 *)options;
Expand Down Expand Up @@ -895,12 +936,16 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)

status = efi_call_phys3(sys_table->boottime->handle_protocol,
handle, &proto, (void *)&image);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
goto fail;
}

status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc lowmem for boot params\n");
goto fail;
}

memset(boot_params, 0x0, 0x4000);

Expand Down Expand Up @@ -933,8 +978,10 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
if (status != EFI_SUCCESS) {
status = low_alloc(hdr->init_size, hdr->kernel_alignment,
&start);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for kernel\n");
goto fail;
}
}

hdr->code32_start = (__u32)start;
Expand All @@ -945,19 +992,25 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, sizeof(*gdt),
(void **)&gdt);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for gdt structure\n");
goto fail;
}

gdt->size = 0x800;
status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for gdt\n");
goto fail;
}

status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, sizeof(*idt),
(void **)&idt);
if (status != EFI_SUCCESS)
if (status != EFI_SUCCESS) {
efi_printk("Failed to alloc mem for idt structure\n");
goto fail;
}

idt->size = 0;
idt->address = 0;
Expand Down
6 changes: 6 additions & 0 deletions arch/x86/boot/compressed/eboot.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -58,4 +58,10 @@ struct efi_uga_draw_protocol {
void *blt;
};

struct efi_simple_text_output_protocol {
void *reset;
void *output_string;
void *test_string;
};

#endif /* BOOT_COMPRESSED_EBOOT_H */

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