upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-06-11 09:41:03 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

kboot: Support reading the smbios vis sysfs

Browse source 
When reading the smbios on Linux we try to access it via /dev/mem. On
some systems we can't do this as /dev/mem is locked down. To handle
this try reading the sysfs file first, and if that fails fall back to
/dev/mem.

Reviewed by:	imp
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D51413
This commit is contained in:
Andrew Turner 2025-07-25 03:07:17 +01:00
parent c04fe26aa2
commit a2e28ba792
1 changed files with 43 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

49
stand/kboot/kboot/main.c
View file

@ -229,6 +229,7 @@ static struct mapping
uintptr_t pa;
caddr_t va;
} map[MAX_MAP];
static bool smbios_mmap_file;
static int smbios_fd;
static int nmap;
@ -238,12 +239,17 @@ caddr_t ptov(uintptr_t pa)
uintptr_t pa2;
struct mapping *m = map;
pa2 = rounddown(pa, PAGE);
if (smbios_mmap_file)
pa2 = rounddown(pa, PAGE);
else
pa2 = pa;
for (int i = 0; i < nmap; i++, m++) {
if (m->pa == pa2) {
return (m->va + pa - m->pa);
}
}
if (!smbios_mmap_file)
panic("Out of bounds smbios access");
if (nmap == MAX_MAP)
panic("Too many maps for smbios");
@ -298,6 +304,7 @@ static void
find_smbios(void)
{
char buf[40];
void *dmi_data;
uintptr_t pa;
caddr_t va;
@ -306,17 +313,47 @@ find_smbios(void)
if (pa == 0)
return;
dmi_data = NULL;
smbios_fd = host_open("/sys/firmware/dmi/tables/DMI", O_RDONLY, 0);
if (smbios_fd >= 0) {
struct host_kstat sb;
struct mapping *m;
if (host_fstat(smbios_fd, &sb) < 0) {
host_close(smbios_fd);
goto try_dev_mem;
}
dmi_data = malloc(sb.st_size);
if (dmi_data == NULL) {
host_close(smbios_fd);
goto try_dev_mem;
}
host_read(smbios_fd, dmi_data, sb.st_size);
m = &map[nmap++];
m->pa = pa;
m->va = dmi_data;
smbios_mmap_file = false;
} else {
try_dev_mem:
smbios_fd = host_open("/dev/mem", O_RDONLY, 0);
if (smbios_fd < 0) {
printf("Can't open /sys/firmware/dmi/tables/DMI or "
"/dev/mem to read smbios\n");
return;
}
smbios_mmap_file = true;
}
snprintf(buf, sizeof(buf), "%#jx", (uintmax_t)pa);
setenv("hint.smbios.0.mem", buf, 1);
smbios_fd = host_open("/dev/mem", O_RDONLY, 0);
if (smbios_fd < 0) {
printf("Can't open /dev/mem to read smbios\n");
return;
}
va = ptov(pa);
printf("Start of smbios at pa %p va %p\n", (void *)pa, va);
smbios_detect(va);
smbios_cleanup();
free(dmi_data);
host_close(smbios_fd);
}