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Subject[PATCH 06/10] efi/libstub/x86: use mixed mode helpers to populate efi_config
Date
The efi_config struct returned by __efi_early() contains a couple
of pointers that are obtained from the EFI system table, which
could be 32-bit on a 64-bit system. For this reason, there are
two versions of the setup_boot_services() routine, one for 32-bit
and one for 64-bit.

We have helpers now that hide all this nastiness, so let's use
those instead.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/boot/compressed/eboot.c | 27 +++++---------------
arch/x86/boot/compressed/head_32.S | 6 ++---
arch/x86/include/asm/efi.h | 6 ++---
arch/x86/platform/efi/efi.c | 4 +--
include/linux/efi.h | 6 ++---
5 files changed, 18 insertions(+), 31 deletions(-)

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 34962f2f3337..6d833f93a878 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -27,19 +27,12 @@ __pure const struct efi_config *__efi_early(void)
return efi_early;
}

-#define BOOT_SERVICES(bits) \
-static void setup_boot_services##bits(struct efi_config *c) \
-{ \
- efi_system_table_##bits##_t *table; \
- \
- table = (typeof(table))sys_table; \
- \
- c->runtime_services = table->runtime; \
- c->boot_services = table->boottime; \
- c->text_output = table->con_out; \
+static void setup_boot_services(struct efi_config *c)
+{
+ c->runtime_services = efi_table_attr(efi_system_table, runtime, sys_table);
+ c->boot_services = efi_table_attr(efi_system_table, boottime, sys_table);
+ c->text_output = efi_table_attr(efi_system_table, con_out, sys_table);
}
-BOOT_SERVICES(32);
-BOOT_SERVICES(64);

void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
{
@@ -399,10 +392,7 @@ struct boot_params *make_boot_params(struct efi_config *c)
if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
return NULL;

- if (efi_is_64bit())
- setup_boot_services64(efi_early);
- else
- setup_boot_services32(efi_early);
+ setup_boot_services(efi_early);

status = efi_call_early(handle_protocol, handle,
&proto, (void *)&image);
@@ -761,10 +751,7 @@ efi_main(struct efi_config *c, struct boot_params *boot_params)
if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
goto fail;

- if (efi_is_64bit())
- setup_boot_services64(efi_early);
- else
- setup_boot_services32(efi_early);
+ setup_boot_services(efi_early);

/*
* make_boot_params() may have been called before efi_main(), in which
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index f2dfd6d083ef..40468ab49b9b 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -163,7 +163,7 @@ SYM_FUNC_START(efi_pe_entry)

/* Relocate efi_config->call() */
leal efi32_config(%esi), %eax
- add %esi, 40(%eax)
+ add %esi, 28(%eax)
pushl %eax

call make_boot_params
@@ -190,7 +190,7 @@ SYM_FUNC_START(efi32_stub_entry)

/* Relocate efi_config->call() */
leal efi32_config(%esi), %eax
- add %esi, 40(%eax)
+ add %esi, 28(%eax)
pushl %eax
2:
call efi_main
@@ -265,7 +265,7 @@ SYM_FUNC_END(.Lrelocated)
#ifdef CONFIG_EFI_STUB
.data
efi32_config:
- .fill 5,8,0
+ .fill 7,4,0
.long efi_call_phys
.long 0
.byte 0
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 37364c43296e..2244232108a0 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -202,9 +202,9 @@ static inline efi_status_t efi_thunk_set_virtual_address_map(
struct efi_config {
u64 image_handle;
u64 table;
- u64 runtime_services;
- u64 boot_services;
- u64 text_output;
+ efi_runtime_services_t *runtime_services;
+ efi_boot_services_t *boot_services;
+ efi_simple_text_output_protocol_t *text_output;
efi_status_t (*call)(unsigned long, ...);
bool is64;
} __packed;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 1493e964c267..27700268ed4a 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -388,7 +388,7 @@ static int __init efi_systab_init(void *phys)
tmp |= systab64->con_in;
efi_systab.con_out_handle = systab64->con_out_handle;
tmp |= systab64->con_out_handle;
- efi_systab.con_out = systab64->con_out;
+ efi_systab.con_out = (void *)(unsigned long)systab64->con_out;
tmp |= systab64->con_out;
efi_systab.stderr_handle = systab64->stderr_handle;
tmp |= systab64->stderr_handle;
@@ -430,7 +430,7 @@ static int __init efi_systab_init(void *phys)
efi_systab.con_in_handle = systab32->con_in_handle;
efi_systab.con_in = systab32->con_in;
efi_systab.con_out_handle = systab32->con_out_handle;
- efi_systab.con_out = systab32->con_out;
+ efi_systab.con_out = (void *)(unsigned long)systab32->con_out;
efi_systab.stderr_handle = systab32->stderr_handle;
efi_systab.stderr = systab32->stderr;
efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7d7ea32a9990..e17c16d8d523 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -810,7 +810,7 @@ typedef struct {
unsigned long con_in_handle;
unsigned long con_in;
unsigned long con_out_handle;
- unsigned long con_out;
+ struct efi_simple_text_output_protocol *con_out;
unsigned long stderr_handle;
unsigned long stderr;
efi_runtime_services_t *runtime;
@@ -1445,11 +1445,11 @@ typedef struct {
u64 test_string;
} efi_simple_text_output_protocol_64_t;

-struct efi_simple_text_output_protocol {
+typedef struct efi_simple_text_output_protocol {
void *reset;
efi_status_t (*output_string)(void *, void *);
void *test_string;
-};
+} efi_simple_text_output_protocol_t;

#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0
#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1
--
2.17.1
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