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kboot/amd64: Use segs framework to find kernel location

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Use the segs framework to find a place to land the kernel, with the same
super ugly defaults as aarch64.

Sponsored by:		Netflix
Reviewed by:		kevans,	jhibbits
Differential Revision:	https://reviews.freebsd.org/D49866
This commit is contained in:
Warner Losh 2025-04-16 22:04:58 -06:00
parent 9acf642220
commit 50bc81e700
1 changed files with 15 additions and 12 deletions
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27
stand/kboot/kboot/arch/amd64/load_addr.c
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@ -43,23 +43,26 @@ enumerate_memory_arch(void)
return (true);
}
/* XXX refactor with aarch64 */
uint64_t
kboot_get_phys_load_segment(void)
{
static uint64_t base_seg = BAD_SEG;
#define HOLE_SIZE (64ul << 20)
#define KERN_ALIGN (2ul << 20)
static uint64_t s = 0;
if (base_seg != BAD_SEG)
return (base_seg);
if (s != 0)
return (s);
if (nr_seg > 0)
base_seg = find_ram(segs, nr_seg, 2ULL << 20, 2ULL << 20,
64ULL << 20, 4ULL << 30);
if (base_seg == BAD_SEG) {
/* XXX Should fall back to using /proc/iomem maybe? */
/* XXX PUNT UNTIL I NEED SOMETHING BETTER */
base_seg = 300ULL * (1 << 20);
}
return (base_seg);
print_avail();
s = first_avail(KERN_ALIGN, HOLE_SIZE, SYSTEM_RAM);
printf("KBOOT GET PHYS Using %#llx\n", (long long)s);
if (s != 0)
return (s);
s = 0x40000000 | 0x4200000; /* should never get here */
/* XXX PANIC? XXX */
printf("Falling back to the crazy address %#lx which works in qemu\n", s);
return (s);
}
void