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ARM: early traps initialisation

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Provide a couple of helpers to copy the vectors and stubs, and also
to flush the copied vectors and stubs.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King (Oracle) 2022-02-11 19:46:15 +00:00
parent 9dd78194a3
commit 04e91b7324
1 changed files with 21 additions and 6 deletions
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27
arch/arm/kernel/traps.c
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@ -787,10 +787,22 @@ static inline void __init kuser_init(void *vectors)
}
#endif
#ifndef CONFIG_CPU_V7M
static void copy_from_lma(void *vma, void *lma_start, void *lma_end)
{
memcpy(vma, lma_start, lma_end - lma_start);
}
static void flush_vectors(void *vma, size_t offset, size_t size)
{
unsigned long start = (unsigned long)vma + offset;
unsigned long end = start + size;
flush_icache_range(start, end);
}
void __init early_trap_init(void *vectors_base)
{
#ifndef CONFIG_CPU_V7M
unsigned long vectors = (unsigned long)vectors_base;
extern char __stubs_start[], __stubs_end[];
extern char __vectors_start[], __vectors_end[];
unsigned i;
@ -811,17 +823,20 @@ void __init early_trap_init(void *vectors_base)
* into the vector page, mapped at 0xffff0000, and ensure these
* are visible to the instruction stream.
*/
memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);
memcpy((void *)vectors + 0x1000, __stubs_start, __stubs_end - __stubs_start);
copy_from_lma(vectors_base, __vectors_start, __vectors_end);
copy_from_lma(vectors_base + 0x1000, __stubs_start, __stubs_end);
kuser_init(vectors_base);
flush_icache_range(vectors, vectors + PAGE_SIZE * 2);
flush_vectors(vectors_base, 0, PAGE_SIZE * 2);
}
#else /* ifndef CONFIG_CPU_V7M */
void __init early_trap_init(void *vectors_base)
{
/*
* on V7-M there is no need to copy the vector table to a dedicated
* memory area. The address is configurable and so a table in the kernel
* image can be used.
*/
#endif
}
#endif