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SoC: sdm845: find and save KASLR to env variables

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KASLR address is needed to boot fully functional Android.
KASLR is set by primary bootloader, and since u-boot is used
as a secondary bootloader(replacing kernel) on sdm845 platform,
KASLR may be found by comparing memory chunks at relocaddr over
supposed KASLR range.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Dzmitry Sankouski 2022-12-27 22:47:09 +03:00 committed by Tom Rini
parent 40c69cc922
commit 971ccee2fb
1 changed files with 18 additions and 0 deletions
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18
arch/arm/mach-snapdragon/init_sdm845.c
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@ -78,5 +78,23 @@ __weak int misc_init_r(void)
env_set("key_power", "0");
}
/*
* search for kaslr address, set by primary bootloader by searching first
* 0x100 relocated bytes at u-boot's initial load address range
*/
uintptr_t start = gd->ram_base;
uintptr_t end = start + 0x800000;
u8 *addr = (u8 *)start;
phys_addr_t *relocaddr = (phys_addr_t *)gd->relocaddr;
u32 block_size = 0x1000;
while (memcmp(addr, relocaddr, 0x100) && (uintptr_t)addr < end)
addr += block_size;
if ((uintptr_t)addr >= end)
printf("KASLR not found in range 0x%lx - 0x%lx", start, end);
else
env_set_addr("KASLR", addr);
return 0;
}