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efi/arm: libstub: move ARM specific code out of generic routines

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Move some code that is only reachable when IS_ENABLED(CONFIG_ARM) into
the ARM EFI arch code.

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-09-16 10:04:57 +02:00
parent 71c7adc9ff
commit 69e377b289
4 changed files with 84 additions and 61 deletions
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3
arch/arm/include/asm/efi.h
View file

@ -17,6 +17,7 @@
#ifdef CONFIG_EFI
void efi_init(void);
void arm_efi_init(void);
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
@ -37,7 +38,7 @@ void efi_virtmap_load(void);
void efi_virtmap_unload(void);
#else
#define efi_init()
#define arm_efi_init()
#endif /* CONFIG_EFI */
/* arch specific definitions used by the stub code */

79
arch/arm/kernel/efi.c
View file

@ -4,6 +4,7 @@
*/
#include <linux/efi.h>
#include <linux/memblock.h>
#include <asm/efi.h>
#include <asm/mach/map.h>
#include <asm/mmu_context.h>
@ -73,3 +74,81 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
return efi_set_mapping_permissions(mm, md);
return 0;
}
static unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata cpu_state_table = EFI_INVALID_TABLE_ADDR;
const efi_config_table_type_t efi_arch_tables[] __initconst = {
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
{}
};
static void __init load_screen_info_table(void)
{
struct screen_info *si;
if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
si = early_memremap_ro(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
early_memunmap(si, sizeof(*si));
/* dummycon on ARM needs non-zero values for columns/lines */
screen_info.orig_video_cols = 80;
screen_info.orig_video_lines = 25;
if (memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base,
screen_info.lfb_size);
}
}
static void __init load_cpu_state_table(void)
{
if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
struct efi_arm_entry_state *state;
bool dump_state = true;
state = early_memremap_ro(cpu_state_table,
sizeof(struct efi_arm_entry_state));
if (state == NULL) {
pr_warn("Unable to map CPU entry state table.\n");
return;
}
if ((state->sctlr_before_ebs & 1) == 0)
pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
else if ((state->sctlr_after_ebs & 1) == 0)
pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
else
dump_state = false;
if (dump_state || efi_enabled(EFI_DBG)) {
pr_info("CPSR at EFI stub entry : 0x%08x\n",
state->cpsr_before_ebs);
pr_info("SCTLR at EFI stub entry : 0x%08x\n",
state->sctlr_before_ebs);
pr_info("CPSR after ExitBootServices() : 0x%08x\n",
state->cpsr_after_ebs);
pr_info("SCTLR after ExitBootServices(): 0x%08x\n",
state->sctlr_after_ebs);
}
early_memunmap(state, sizeof(struct efi_arm_entry_state));
}
}
void __init arm_efi_init(void)
{
efi_init();
load_screen_info_table();
/* ARM does not permit early mappings to persist across paging_init() */
efi_memmap_unmap();
load_cpu_state_table();
}

2
arch/arm/kernel/setup.c
View file

@ -1141,7 +1141,7 @@ void __init setup_arch(char **cmdline_p)
#endif
setup_dma_zone(mdesc);
xen_early_init();
efi_init();
arm_efi_init();
/*
* Make sure the calculation for lowmem/highmem is set appropriately
* before reserving/allocating any memory

61
drivers/firmware/efi/efi-init.c
View file

@ -51,34 +51,10 @@ static phys_addr_t __init efi_to_phys(unsigned long addr)
return addr;
}
static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR;
static const efi_config_table_type_t arch_tables[] __initconst = {
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
{}
};
extern __weak const efi_config_table_type_t efi_arch_tables[];
static void __init init_screen_info(void)
{
struct screen_info *si;
if (IS_ENABLED(CONFIG_ARM) &&
screen_info_table != EFI_INVALID_TABLE_ADDR) {
si = early_memremap_ro(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
early_memunmap(si, sizeof(*si));
/* dummycon on ARM needs non-zero values for columns/lines */
screen_info.orig_video_cols = 80;
screen_info.orig_video_lines = 25;
}
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
@ -119,8 +95,7 @@ static int __init uefi_init(u64 efi_system_table)
goto out;
}
retval = efi_config_parse_tables(config_tables, systab->nr_tables,
IS_ENABLED(CONFIG_ARM) ? arch_tables
: NULL);
efi_arch_tables);
early_memunmap(config_tables, table_size);
out:
@ -248,36 +223,4 @@ void __init efi_init(void)
PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
init_screen_info();
#ifdef CONFIG_ARM
/* ARM does not permit early mappings to persist across paging_init() */
efi_memmap_unmap();
if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
struct efi_arm_entry_state *state;
bool dump_state = true;
state = early_memremap_ro(cpu_state_table,
sizeof(struct efi_arm_entry_state));
if (state == NULL) {
pr_warn("Unable to map CPU entry state table.\n");
return;
}
if ((state->sctlr_before_ebs & 1) == 0)
pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
else if ((state->sctlr_after_ebs & 1) == 0)
pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
else
dump_state = false;
if (dump_state || efi_enabled(EFI_DBG)) {
pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs);
pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs);
pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs);
pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs);
}
early_memunmap(state, sizeof(struct efi_arm_entry_state));
}
#endif
}