Page MenuHomeFreeBSD
Files F110669321

D39792.diff
No OneTemporary
Actions

D39792.diff
View Options

diff --git a/stand/kboot/main.c b/stand/kboot/main.c
--- a/stand/kboot/main.c
+++ b/stand/kboot/main.c
@@ -36,6 +36,7 @@
#include "host_syscall.h"
#include "kboot.h"
#include "stand.h"
+#include <smbios.h>
struct arch_switch archsw;
extern void *_end;
@@ -195,6 +196,107 @@
return rsdp != 0;
}
+/*
+ * SMBIOS support. We map the physical memory address we get into a VA in this
+ * address space with mmap with 64k pages. Once we're done, we cleanup any
+ * mappings we made.
+ */
+
+#define MAX_MAP 10
+#define PAGE (64<<10)
+
+static struct mapping
+{
+ uintptr_t pa;
+ caddr_t va;
+} map[MAX_MAP];
+static int smbios_fd;
+static int nmap;
+
+caddr_t ptov(uintptr_t pa)
+{
+ caddr_t va;
+ uintptr_t pa2;
+ struct mapping *m = map;
+
+ pa2 = rounddown(pa, PAGE);
+ for (int i = 0; i < nmap; i++, m++) {
+ if (m->pa == pa2) {
+ return (m->va + pa - m->pa);
+ }
+ }
+ if (nmap == MAX_MAP)
+ panic("Too many maps for smbios");
+
+ /*
+ * host_mmap returns small negative numbers on errors, can't return an
+ * error here, so we have to panic. The Linux wrapper will set errno
+ * based on this and then return HOST_MAP_FAILED. Since we're calling
+ * the raw system call we have to do that ourselves.
+ */
+ va = host_mmap(0, PAGE, HOST_PROT_READ, HOST_MAP_SHARED, smbios_fd, pa2);
+ if ((intptr_t)va < 0 && (intptr_t)va >= -511)
+ panic("smbios mmap offset %#jx failed", (uintmax_t)pa2);
+ m = &map[nmap++];
+ m->pa = pa2;
+ m->va = va;
+ return (m->va + pa - m->pa);
+}
+
+static void
+smbios_cleanup(void)
+{
+ for (int i = 0; i < nmap; i++) {
+ host_munmap(map[i].va, PAGE);
+ }
+}
+
+static vm_offset_t
+kboot_find_smbios(void)
+{
+ char buffer[512 + 1];
+ char *walker, *ep;
+
+ if (!file2str("/sys/firmware/efi/systab", buffer, sizeof(buffer)))
+ return (0); /* Not an EFI system */
+ ep = buffer + strlen(buffer);
+ walker = buffer;
+ while (walker <= ep) {
+ if (strncmp("SMBIOS3=", walker, 8) == 0)
+ return((vm_offset_t)strtoull(walker + 8, NULL, 0));
+ if (strncmp("SMBIOS=", walker, 7) == 0)
+ return((vm_offset_t)strtoull(walker + 7, NULL, 0));
+ walker += strcspn(walker, "\n") + 1;
+ }
+ return (0);
+}
+
+static void
+find_smbios(void)
+{
+ char buf[40];
+ uintptr_t pa;
+ caddr_t va;
+
+ pa = kboot_find_smbios();
+ printf("SMBIOS at %#jx\n", (uintmax_t)pa);
+ if (pa == 0)
+ return;
+
+ 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();
+ host_close(smbios_fd);
+}
+
static void
parse_file(const char *fn)
{
@@ -300,6 +402,8 @@
*/
find_acpi();
+ find_smbios();
+
interact(); /* doesn't return */
return (0);
@@ -531,5 +635,6 @@
return (command_fdt_internal(argc, argv));
}
-
+
COMMAND_SET(fdt, "fdt", "flattened device tree handling", command_fdt);
+

File Metadata

Mime Type
text/plain
Expires
Sat, Feb 22, 5:13 PM (8 h, 55 m)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
16775546
Default Alt Text
D39792.diff (2 KB)

Event Timeline