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arm64: idreg-override: use early FDT mapping in ID map 

Instead of calling into the kernel to map the FDT into the kernel page
tables before even calling start_kernel(), let's switch to the initial,
temporary mapping of the device tree that has been added to the ID map.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-16-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-06-24 17:06:45 +02:00 committed by Will Deacon
parent f70b3a2332
commit a004393f45
2 changed files with 7 additions and 11 deletions
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1
arch/arm64/kernel/head.S
View File

@ -472,6 +472,7 @@ SYM_FUNC_START_LOCAL(__primary_switched)
#endif
mov x0, x21 // pass FDT address in x0
bl early_fdt_map // Try mapping the FDT early
mov x0, x22 // pass FDT address in x0
bl init_feature_override // Parse cpu feature overrides
#ifdef CONFIG_RANDOMIZE_BASE
tst x23, ~(MIN_KIMG_ALIGN - 1) // already running randomized?

17
arch/arm64/kernel/idreg-override.c
View File

@ -201,16 +201,11 @@ static __init void __parse_cmdline(const char *cmdline, bool parse_aliases)
} while (1);
}
static __init const u8 *get_bootargs_cmdline(void)
static __init const u8 *get_bootargs_cmdline(const void *fdt)
{
const u8 *prop;
void *fdt;
int node;
fdt = get_early_fdt_ptr();
if (!fdt)
return NULL;
node = fdt_path_offset(fdt, "/chosen");
if (node < 0)
return NULL;
@ -222,9 +217,9 @@ static __init const u8 *get_bootargs_cmdline(void)
return strlen(prop) ? prop : NULL;
}
static __init void parse_cmdline(void)
static __init void parse_cmdline(const void *fdt)
{
const u8 *prop = get_bootargs_cmdline();
const u8 *prop = get_bootargs_cmdline(fdt);
if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !prop)
__parse_cmdline(CONFIG_CMDLINE, true);
@ -234,9 +229,9 @@ static __init void parse_cmdline(void)
}
/* Keep checkers quiet */
void init_feature_override(void);
void init_feature_override(const void *fdt);
asmlinkage void __init init_feature_override(void)
asmlinkage void __init init_feature_override(const void *fdt)
{
int i;
@ -247,7 +242,7 @@ asmlinkage void __init init_feature_override(void)
}
}
parse_cmdline();
parse_cmdline(fdt);
for (i = 0; i < ARRAY_SIZE(regs); i++) {
if (regs[i]->override)