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x86/efi: Build our own EFI services pointer table

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It's not possible to dereference the EFI System table directly when
booting a 64-bit kernel on a 32-bit EFI firmware because the size of
pointers don't match.

In preparation for supporting the above use case, build a list of
function pointers on boot so that callers don't have to worry about
converting pointer sizes through multiple levels of indirection.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming
2014-01-10 15:27:14 +00:00
parent 677703cef0
commit 54b52d8726
5 changed files with 378 additions and 212 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/x86/boot/compressed/eboot.c
+236 -85
View File
File diff suppressed because it is too large Load Diff
arch/x86/boot/compressed/eboot.h
+16
View File
@@ -103,4 +103,20 @@ struct efi_uga_draw_protocol {
void *blt;
};
struct efi_config {
u64 image_handle;
u64 table;
u64 allocate_pool;
u64 allocate_pages;
u64 get_memory_map;
u64 free_pool;
u64 free_pages;
u64 locate_handle;
u64 handle_protocol;
u64 exit_boot_services;
u64 text_output;
efi_status_t (*call)(unsigned long, ...);
bool is64;
} __packed;
#endif /* BOOT_COMPRESSED_EBOOT_H */
arch/x86/boot/compressed/head_32.S
+41 -7
View File
@@ -42,26 +42,53 @@ ENTRY(startup_32)
ENTRY(efi_pe_entry)
add $0x4, %esp
call 1f
1: popl %esi
subl $1b, %esi
popl %ecx
movl %ecx, efi32_config(%esi) /* Handle */
popl %ecx
movl %ecx, efi32_config+8(%esi) /* EFI System table pointer */
/* Relocate efi_config->call() */
leal efi32_config(%esi), %eax
add %esi, 88(%eax)
pushl %eax
call make_boot_params
cmpl $0, %eax
je 1f
movl 0x4(%esp), %esi
movl (%esp), %ecx
je fail
popl %ecx
pushl %eax
pushl %esi
pushl %ecx
sub $0x4, %esp
jmp 2f /* Skip efi_config initialization */
ENTRY(efi_stub_entry)
add $0x4, %esp
popl %ecx
popl %edx
call 1f
1: popl %esi
subl $1b, %esi
movl %ecx, efi32_config(%esi) /* Handle */
movl %edx, efi32_config+8(%esi) /* EFI System table pointer */
/* Relocate efi_config->call() */
leal efi32_config(%esi), %eax
add %esi, 88(%eax)
pushl %eax
2:
call efi_main
cmpl $0, %eax
movl %eax, %esi
jne 2f
1:
fail:
/* EFI init failed, so hang. */
hlt
jmp 1b
jmp fail
2:
call 3f
3:
@@ -202,6 +229,13 @@ relocated:
xorl %ebx, %ebx
jmp *%eax
.data
efi32_config:
.fill 11,8,0
.long efi_call_phys
.long 0
.byte 0
/*
* Stack and heap for uncompression
*/
arch/x86/boot/compressed/head_64.S
+47 -10
View File
@@ -209,26 +209,55 @@ ENTRY(startup_64)
jmp preferred_addr
ENTRY(efi_pe_entry)
mov %rcx, %rdi
mov %rdx, %rsi
pushq %rdi
pushq %rsi
movq %rcx, efi64_config(%rip) /* Handle */
movq %rdx, efi64_config+8(%rip) /* EFI System table pointer */
leaq efi64_config(%rip), %rax
movq %rax, efi_config(%rip)
call 1f
1: popq %rbp
subq $1b, %rbp
/*
* Relocate efi_config->call().
*/
addq %rbp, efi64_config+88(%rip)
movq %rax, %rdi
call make_boot_params
cmpq $0,%rax
je 1f
mov %rax, %rdx
popq %rsi
popq %rdi
je fail
mov %rax, %rsi
jmp 2f /* Skip the relocation */
ENTRY(efi_stub_entry)
movq %rdi, efi64_config(%rip) /* Handle */
movq %rsi, efi64_config+8(%rip) /* EFI System table pointer */
leaq efi64_config(%rip), %rax
movq %rax, efi_config(%rip)
call 1f
1: popq %rbp
subq $1b, %rbp
/*
* Relocate efi_config->call().
*/
movq efi_config(%rip), %rax
addq %rbp, 88(%rax)
movq %rdx, %rsi
2:
movq efi_config(%rip), %rdi
call efi_main
movq %rax,%rsi
cmpq $0,%rax
jne 2f
1:
fail:
/* EFI init failed, so hang. */
hlt
jmp 1b
jmp fail
2:
call 3f
3:
@@ -372,6 +401,14 @@ gdt:
.quad 0x0000000000000000 /* TS continued */
gdt_end:
efi_config:
.quad 0
.global efi64_config
efi64_config:
.fill 11,8,0
.quad efi_call6
.byte 1
/*
* Stack and heap for uncompression
*/
drivers/firmware/efi/efi-stub-helper.c
+38 -110
View File
@@ -16,18 +16,6 @@ struct file_info {
u64 size;
};
static void efi_char16_printk(efi_system_table_t *sys_table_arg,
efi_char16_t *str)
{
struct efi_simple_text_output_protocol *out;
out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
efi_call_phys2(out->output_string, out, str);
}
static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
{
char *s8;
@@ -65,20 +53,23 @@ again:
* allocation which may be in a new descriptor region.
*/
*map_size += sizeof(*m);
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
EFI_LOADER_DATA, *map_size, (void **)&m);
status = efi_early->call(efi_early->allocate_pool, EFI_LOADER_DATA,
*map_size, (void **)&m);
if (status != EFI_SUCCESS)
goto fail;
status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
map_size, m, &key, desc_size, &desc_version);
*desc_size = 0;
key = 0;
status = efi_early->call(efi_early->get_memory_map, map_size, m,
&key, desc_size, &desc_version);
if (status == EFI_BUFFER_TOO_SMALL) {
efi_call_phys1(sys_table_arg->boottime->free_pool, m);
efi_early->call(efi_early->free_pool, m);
goto again;
}
if (status != EFI_SUCCESS)
efi_call_phys1(sys_table_arg->boottime->free_pool, m);
efi_early->call(efi_early->free_pool, m);
if (key_ptr && status == EFI_SUCCESS)
*key_ptr = key;
if (desc_ver && status == EFI_SUCCESS)
@@ -158,9 +149,9 @@ again:
if (!max_addr)
status = EFI_NOT_FOUND;
else {
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &max_addr);
status = efi_early->call(efi_early->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &max_addr);
if (status != EFI_SUCCESS) {
max = max_addr;
max_addr = 0;
@@ -170,8 +161,7 @@ again:
*addr = max_addr;
}
efi_call_phys1(sys_table_arg->boottime->free_pool, map);
efi_early->call(efi_early->free_pool, map);
fail:
return status;
}
@@ -231,9 +221,9 @@ static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
if ((start + size) > end)
continue;
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &start);
status = efi_early->call(efi_early->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &start);
if (status == EFI_SUCCESS) {
*addr = start;
break;
@@ -243,7 +233,7 @@ static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
if (i == map_size / desc_size)
status = EFI_NOT_FOUND;
efi_call_phys1(sys_table_arg->boottime->free_pool, map);
efi_early->call(efi_early->free_pool, map);
fail:
return status;
}
@@ -257,7 +247,7 @@ static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
return;
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
efi_early->call(efi_early->free_pages, addr, nr_pages);
}
@@ -276,9 +266,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
{
struct file_info *files;
unsigned long file_addr;
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
u64 file_size_total;
efi_file_io_interface_t *io;
efi_file_handle_t *fh;
efi_status_t status;
int nr_files;
@@ -319,10 +307,8 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
if (!nr_files)
return EFI_SUCCESS;
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
EFI_LOADER_DATA,
nr_files * sizeof(*files),
(void **)&files);
status = efi_early->call(efi_early->allocate_pool, EFI_LOADER_DATA,
nr_files * sizeof(*files), (void **)&files);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
goto fail;
@@ -331,13 +317,8 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
str = cmd_line;
for (i = 0; i < nr_files; i++) {
struct file_info *file;
efi_file_handle_t *h;
efi_file_info_t *info;
efi_char16_t filename_16[256];
unsigned long info_sz;
efi_guid_t info_guid = EFI_FILE_INFO_ID;
efi_char16_t *p;
u64 file_sz;
str = strstr(str, option_string);
if (!str)
@@ -368,71 +349,18 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
/* Only open the volume once. */
if (!i) {
efi_boot_services_t *boottime;
boottime = sys_table_arg->boottime;
status = efi_call_phys3(boottime->handle_protocol,
image->device_handle, &fs_proto,
(void **)&io);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
status = efi_open_volume(sys_table_arg, image,
(void **)&fh);
if (status != EFI_SUCCESS)
goto free_files;
}
status = efi_call_phys2(io->open_volume, io, &fh);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to open volume\n");
goto free_files;
}
}
status = efi_call_phys5(fh->open, fh, &h, filename_16,
EFI_FILE_MODE_READ, (u64)0);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to open file: ");
efi_char16_printk(sys_table_arg, filename_16);
efi_printk(sys_table_arg, "\n");
status = efi_file_size(sys_table_arg, fh, filename_16,
(void **)&file->handle, &file->size);
if (status != EFI_SUCCESS)
goto close_handles;
}
file->handle = h;
info_sz = 0;
status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, NULL);
if (status != EFI_BUFFER_TOO_SMALL) {
efi_printk(sys_table_arg, "Failed to get file info size\n");
goto close_handles;
}
grow:
status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
EFI_LOADER_DATA, info_sz,
(void **)&info);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
goto close_handles;
}
status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, info);
if (status == EFI_BUFFER_TOO_SMALL) {
efi_call_phys1(sys_table_arg->boottime->free_pool,
info);
goto grow;
}
file_sz = info->file_size;
efi_call_phys1(sys_table_arg->boottime->free_pool, info);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to get file info\n");
goto close_handles;
}
file->size = file_sz;
file_size_total += file_sz;
file_size_total += file->size;
}
if (file_size_total) {
@@ -468,10 +396,10 @@ grow:
chunksize = EFI_READ_CHUNK_SIZE;
else
chunksize = size;
status = efi_call_phys3(fh->read,
files[j].handle,
&chunksize,
(void *)addr);
status = efi_file_read(fh, files[j].handle,
&chunksize,
(void *)addr);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to read file\n");
goto free_file_total;
@@ -480,12 +408,12 @@ grow:
size -= chunksize;
}
efi_call_phys1(fh->close, files[j].handle);
efi_file_close(fh, files[j].handle);
}
}
efi_call_phys1(sys_table_arg->boottime->free_pool, files);
efi_early->call(efi_early->free_pool, files);
*load_addr = file_addr;
*load_size = file_size_total;
@@ -497,9 +425,9 @@ free_file_total:
close_handles:
for (k = j; k < i; k++)
efi_call_phys1(fh->close, files[k].handle);
efi_file_close(fh, files[k].handle);
free_files:
efi_call_phys1(sys_table_arg->boottime->free_pool, files);
efi_early->call(efi_early->free_pool, files);
fail:
*load_addr = 0;
*load_size = 0;
@@ -545,9 +473,9 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
* as possible while respecting the required alignment.
*/
nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &efi_addr);
status = efi_early->call(efi_early->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &efi_addr);
new_addr = efi_addr;
/*
* If preferred address allocation failed allocate as low as