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stand/efi: Limit where we load the arm64 kernel

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When FEAT_LPA2 is implemented the hardware supports increasing the
physical address space from 48-bit to 52-bit.

As older kernels only support a 48-bit physical address space limit
where the kernel is loaded to this.

Reviewed by:	kib, markj
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D46625
This commit is contained in:
Andrew Turner 2025-01-24 11:37:01 +00:00
parent 3041b63646
commit d249bcb712
1 changed files with 13 additions and 2 deletions
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15
stand/efi/loader/copy.c
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@ -290,6 +290,17 @@ get_staging_max(void)
res = copy_staging == COPY_STAGING_ENABLE ? G(1) : G(4);
return (res);
}
#define EFI_ALLOC_MAX_ADDR
#elif defined(__aarch64__)
/*
* Older kernels only support a 48-bit physical address space, and locore.S
* only supports a 50-bit space. Limit to 48 bits so older kernels can boot
* even if FEAT_LPA2 is supported by the hardware.
*/
#define get_staging_max() (1ul << 48)
#define EFI_ALLOC_MAX_ADDR
#endif
#ifdef EFI_ALLOC_MAX_ADDR
#define EFI_ALLOC_METHOD AllocateMaxAddress
#else
#define EFI_ALLOC_METHOD AllocateAnyPages
@ -316,7 +327,7 @@ efi_copy_init(void)
if (running_on_hyperv())
efi_verify_staging_size(&nr_pages);
#endif
#if defined(__amd64__) || defined(__i386__)
#ifdef EFI_ALLOC_MAX_ADDR
staging = get_staging_max();
#endif
status = BS->AllocatePages(EFI_ALLOC_METHOD, EfiLoaderCode,
@ -424,7 +435,7 @@ expand:
#if EFI_STAGING_2M_ALIGN
nr_pages += M(2) / EFI_PAGE_SIZE;
#endif
#if defined(__amd64__) || defined(__i386__)
#ifdef EFI_ALLOC_MAX_ADDR
new_base = get_staging_max();
#endif
status = BS->AllocatePages(EFI_ALLOC_METHOD, EfiLoaderCode,