Module Name: src
Committed By: rin
Date: Mon Jul 10 07:00:12 UTC 2023
Modified Files:
src/sys/arch/aarch64/aarch64: efi_machdep.c
src/sys/arch/arm/arm: efi_machdep.c efi_runtime.h
src/sys/arch/evbarm/fdt: fdt_machdep.c
src/sys/dev/fdt: fdt_boot.c fdt_boot.h
Added Files:
src/sys/arch/arm/include: efirt.h
src/sys/arch/evbarm/include: efirt.h
Log Message:
Factor out some fdt(4) features from {,evb}arm into dev/fdt.
Now, FDT-based support to efirt, initrd, rndseed, and efirng can be
used from, e.g., riscv.
Mostly from Nick Hudson.
XXX
As Nick comments, there can be some optimizations for fdt_map_range().
efiboot may also be modified to load these objects into aligned PAs.
To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/sys/arch/aarch64/aarch64/efi_machdep.c
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/arm/arm/efi_machdep.c
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/arm/arm/efi_runtime.h
cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/include/efirt.h
cvs rdiff -u -r1.103 -r1.104 src/sys/arch/evbarm/fdt/fdt_machdep.c
cvs rdiff -u -r0 -r1.1 src/sys/arch/evbarm/include/efirt.h
cvs rdiff -u -r1.1 -r1.2 src/sys/dev/fdt/fdt_boot.c \
src/sys/dev/fdt/fdt_boot.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/aarch64/aarch64/efi_machdep.c
diff -u src/sys/arch/aarch64/aarch64/efi_machdep.c:1.13 src/sys/arch/aarch64/aarch64/efi_machdep.c:1.14
--- src/sys/arch/aarch64/aarch64/efi_machdep.c:1.13 Tue May 3 20:10:20 2022
+++ src/sys/arch/aarch64/aarch64/efi_machdep.c Mon Jul 10 07:00:11 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: efi_machdep.c,v 1.13 2022/05/03 20:10:20 skrll Exp $ */
+/* $NetBSD: efi_machdep.c,v 1.14 2023/07/10 07:00:11 rin Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,12 +30,14 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: efi_machdep.c,v 1.13 2022/05/03 20:10:20 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: efi_machdep.c,v 1.14 2023/07/10 07:00:11 rin Exp $");
#include <sys/param.h>
+
#include <uvm/uvm_extern.h>
#include <arm/cpufunc.h>
+#include <arm/efirt.h>
#include <arm/arm/efi_runtime.h>
@@ -49,8 +51,8 @@ static struct {
static bool efi_userva = true;
void
-arm_efirt_md_map_range(vaddr_t va, paddr_t pa, size_t sz,
- enum arm_efirt_mem_type type)
+cpu_efirt_map_range(vaddr_t va, paddr_t pa, size_t sz,
+ enum cpu_efirt_mem_type type)
{
int flags = 0;
int prot = 0;
Index: src/sys/arch/arm/arm/efi_machdep.c
diff -u src/sys/arch/arm/arm/efi_machdep.c:1.3 src/sys/arch/arm/arm/efi_machdep.c:1.4
--- src/sys/arch/arm/arm/efi_machdep.c:1.3 Sun Dec 18 12:02:46 2022
+++ src/sys/arch/arm/arm/efi_machdep.c Mon Jul 10 07:00:12 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: efi_machdep.c,v 1.3 2022/12/18 12:02:46 skrll Exp $ */
+/* $NetBSD: efi_machdep.c,v 1.4 2023/07/10 07:00:12 rin Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,11 +30,13 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: efi_machdep.c,v 1.3 2022/12/18 12:02:46 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: efi_machdep.c,v 1.4 2023/07/10 07:00:12 rin Exp $");
#include <sys/param.h>
+
#include <uvm/uvm_extern.h>
+#include <arm/efirt.h>
#include <arm/vfpreg.h>
#include <arm/arm/efi_runtime.h>
@@ -101,8 +103,8 @@ arm_efirt_md_exit(void)
void
-arm_efirt_md_map_range(vaddr_t va, paddr_t pa, size_t sz,
- enum arm_efirt_mem_type type)
+cpu_efirt_map_range(vaddr_t va, paddr_t pa, size_t sz,
+ enum cpu_efirt_mem_type type)
{
int flags = 0;
int prot = 0;
Index: src/sys/arch/arm/arm/efi_runtime.h
diff -u src/sys/arch/arm/arm/efi_runtime.h:1.4 src/sys/arch/arm/arm/efi_runtime.h:1.5
--- src/sys/arch/arm/arm/efi_runtime.h:1.4 Sun Oct 10 13:03:09 2021
+++ src/sys/arch/arm/arm/efi_runtime.h Mon Jul 10 07:00:12 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: efi_runtime.h,v 1.4 2021/10/10 13:03:09 jmcneill Exp $ */
+/* $NetBSD: efi_runtime.h,v 1.5 2023/07/10 07:00:12 rin Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -44,13 +44,6 @@ efi_status arm_efirt_setvar(uint16_t *,
u_long, void *);
int arm_efirt_reset(enum efi_reset);
-enum arm_efirt_mem_type {
- ARM_EFIRT_MEM_CODE,
- ARM_EFIRT_MEM_DATA,
- ARM_EFIRT_MEM_MMIO,
-};
-
-void arm_efirt_md_map_range(vaddr_t, paddr_t, size_t, enum arm_efirt_mem_type);
int arm_efirt_md_enter(void);
void arm_efirt_md_exit(void);
Index: src/sys/arch/evbarm/fdt/fdt_machdep.c
diff -u src/sys/arch/evbarm/fdt/fdt_machdep.c:1.103 src/sys/arch/evbarm/fdt/fdt_machdep.c:1.104
--- src/sys/arch/evbarm/fdt/fdt_machdep.c:1.103 Sat Apr 22 09:53:45 2023
+++ src/sys/arch/evbarm/fdt/fdt_machdep.c Mon Jul 10 07:00:12 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: fdt_machdep.c,v 1.103 2023/04/22 09:53:45 skrll Exp $ */
+/* $NetBSD: fdt_machdep.c,v 1.104 2023/07/10 07:00:12 rin Exp $ */
/*-
* Copyright (c) 2015-2017 Jared McNeill <jmcne...@invisible.ca>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fdt_machdep.c,v 1.103 2023/04/22 09:53:45 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fdt_machdep.c,v 1.104 2023/07/10 07:00:12 rin Exp $");
#include "opt_arm_debug.h"
#include "opt_bootconfig.h"
@@ -35,7 +35,6 @@ __KERNEL_RCSID(0, "$NetBSD: fdt_machdep.
#include "opt_ddb.h"
#include "opt_efi.h"
#include "opt_machdep.h"
-#include "opt_md.h"
#include "opt_multiprocessor.h"
#include "genfb.h"
@@ -65,8 +64,6 @@ __KERNEL_RCSID(0, "$NetBSD: fdt_machdep.
#include <sys/proc.h>
#include <sys/pserialize.h>
#include <sys/reboot.h>
-#include <sys/rnd.h>
-#include <sys/rndsource.h>
#include <sys/systm.h>
#include <sys/termios.h>
#include <sys/vnode.h>
@@ -113,10 +110,6 @@ __KERNEL_RCSID(0, "$NetBSD: fdt_machdep.
#include <dev/wscons/wsdisplayvar.h>
#endif
-#ifdef MEMORY_DISK_DYNAMIC
-#include <dev/md.h>
-#endif
-
#ifndef FDT_MAX_BOOT_STRING
#define FDT_MAX_BOOT_STRING 1024
#endif
@@ -129,10 +122,6 @@ char *boot_args = NULL;
u_long uboot_args[4] __attribute__((__section__(".data")));
const uint8_t *fdt_addr_r __attribute__((__section__(".data")));
-static uint64_t initrd_start, initrd_end;
-static uint64_t rndseed_start, rndseed_end; /* our on-disk seed */
-static uint64_t efirng_start, efirng_end; /* firmware's EFI RNG output */
-
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
#define FDT_BUF_SIZE (512*1024)
@@ -241,21 +230,10 @@ fdt_build_bootconfig(uint64_t mem_start,
uint64_t addr, size;
int index;
- const uint64_t initrd_size =
- round_page(initrd_end) - trunc_page(initrd_start);
- if (initrd_size > 0)
- fdt_memory_remove_range(trunc_page(initrd_start), initrd_size);
-
- const uint64_t rndseed_size =
- round_page(rndseed_end) - trunc_page(rndseed_start);
- if (rndseed_size > 0)
- fdt_memory_remove_range(trunc_page(rndseed_start),
- rndseed_size);
-
- const uint64_t efirng_size =
- round_page(efirng_end) - trunc_page(efirng_start);
- if (efirng_size > 0)
- fdt_memory_remove_range(trunc_page(efirng_start), efirng_size);
+ /* Reserve pages for ramdisk, rndseed, and firmware's RNG */
+ fdt_reserve_initrd();
+ fdt_reserve_rndseed();
+ fdt_reserve_efirng();
const int framebuffer = OF_finddevice("/chosen/framebuffer");
if (framebuffer >= 0) {
@@ -271,222 +249,6 @@ fdt_build_bootconfig(uint64_t mem_start,
fdt_memory_foreach(fdt_add_dram_blocks, bc);
}
-static void
-fdt_probe_range(const char *startname, const char *endname,
- uint64_t *pstart, uint64_t *pend)
-{
- int chosen, len;
- const void *start_data, *end_data;
-
- *pstart = *pend = 0;
-
- chosen = OF_finddevice("/chosen");
- if (chosen < 0)
- return;
-
- start_data = fdtbus_get_prop(chosen, startname, &len);
- end_data = fdtbus_get_prop(chosen, endname, NULL);
- if (start_data == NULL || end_data == NULL)
- return;
-
- switch (len) {
- case 4:
- *pstart = be32dec(start_data);
- *pend = be32dec(end_data);
- break;
- case 8:
- *pstart = be64dec(start_data);
- *pend = be64dec(end_data);
- break;
- default:
- printf("Unsupported len %d for /chosen `%s'\n",
- len, startname);
- return;
- }
-}
-
-static void *
-fdt_map_range(uint64_t start, uint64_t end, uint64_t *psize,
- const char *purpose)
-{
- const paddr_t startpa = trunc_page(start);
- const paddr_t endpa = round_page(end);
- paddr_t pa;
- vaddr_t va;
- void *ptr;
-
- *psize = end - start;
- if (*psize == 0)
- return NULL;
-
- const vaddr_t voff = start & PAGE_MASK;
-
- va = uvm_km_alloc(kernel_map, *psize, 0, UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
- if (va == 0) {
- printf("Failed to allocate VA for %s\n", purpose);
- return NULL;
- }
- ptr = (void *)(va + voff);
-
- for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE)
- pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
- pmap_update(pmap_kernel());
-
- return ptr;
-}
-
-static void
-fdt_unmap_range(void *ptr, uint64_t size)
-{
- const char *start = ptr, *end = start + size;
- const vaddr_t startva = trunc_page((vaddr_t)(uintptr_t)start);
- const vaddr_t endva = round_page((vaddr_t)(uintptr_t)end);
- const vsize_t sz = endva - startva;
-
- pmap_kremove(startva, sz);
- pmap_update(pmap_kernel());
-
- uvm_km_free(kernel_map, startva, sz, UVM_KMF_VAONLY);
-}
-
-static void
-fdt_probe_initrd(uint64_t *pstart, uint64_t *pend)
-{
- *pstart = *pend = 0;
-
-#ifdef MEMORY_DISK_DYNAMIC
- fdt_probe_range("linux,initrd-start", "linux,initrd-end", pstart, pend);
-#endif
-}
-
-static void
-fdt_setup_initrd(void)
-{
-#ifdef MEMORY_DISK_DYNAMIC
- void *md_start;
- uint64_t initrd_size;
-
- md_start = fdt_map_range(initrd_start, initrd_end, &initrd_size,
- "initrd");
- if (md_start == NULL)
- return;
- md_root_setconf(md_start, initrd_size);
-#endif
-}
-
-static void
-fdt_probe_rndseed(uint64_t *pstart, uint64_t *pend)
-{
-
- fdt_probe_range("netbsd,rndseed-start", "netbsd,rndseed-end",
- pstart, pend);
-}
-
-static void
-fdt_setup_rndseed(void)
-{
- uint64_t rndseed_size;
- void *rndseed;
-
- rndseed = fdt_map_range(rndseed_start, rndseed_end, &rndseed_size,
- "rndseed");
- if (rndseed == NULL)
- return;
- rnd_seed(rndseed, rndseed_size);
- fdt_unmap_range(rndseed, rndseed_size);
-}
-
-static void
-fdt_probe_efirng(uint64_t *pstart, uint64_t *pend)
-{
-
- fdt_probe_range("netbsd,efirng-start", "netbsd,efirng-end",
- pstart, pend);
-}
-
-static struct krndsource efirng_source;
-
-static void
-fdt_setup_efirng(void)
-{
- uint64_t efirng_size;
- void *efirng;
-
- efirng = fdt_map_range(efirng_start, efirng_end, &efirng_size,
- "efirng");
- if (efirng == NULL)
- return;
-
- rnd_attach_source(&efirng_source, "efirng", RND_TYPE_RNG,
- RND_FLAG_DEFAULT);
-
- /*
- * We don't really have specific information about the physical
- * process underlying the data provided by the firmware via the
- * EFI RNG API, so the entropy estimate here is heuristic.
- * What efiboot provides us is up to 4096 bytes of data from
- * the EFI RNG API, although in principle it may return short.
- *
- * The UEFI Specification (2.8 Errata A, February 2020[1]) says
- *
- * When a Deterministic Random Bit Generator (DRBG) is
- * used on the output of a (raw) entropy source, its
- * security level must be at least 256 bits.
- *
- * It's not entirely clear whether `it' refers to the DRBG or
- * the entropy source; if it refers to the DRBG, it's not
- * entirely clear how ANSI X9.31 3DES, one of the options for
- * DRBG in the UEFI spec, can provide a `256-bit security
- * level' because it has only 232 bits of inputs (three 56-bit
- * keys and one 64-bit block). That said, even if it provides
- * only 232 bits of entropy, that's enough to prevent all
- * attacks and we probably get a few more bits from sampling
- * the clock anyway.
- *
- * In the event we get raw samples, e.g. the bits sampled by a
- * ring oscillator, we hope that the samples have at least half
- * a bit of entropy per bit of data -- and efiboot tries to
- * draw 4096 bytes to provide plenty of slop. Hence we divide
- * the total number of bits by two and clamp at 256. There are
- * ways this could go wrong, but on most machines it should
- * behave reasonably.
- *
- * [1] https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_A_Feb14.pdf
- */
- rnd_add_data(&efirng_source, efirng, efirng_size,
- MIN(256, efirng_size*NBBY/2));
-
- explicit_memset(efirng, 0, efirng_size);
- fdt_unmap_range(efirng, efirng_size);
-}
-
-#ifdef EFI_RUNTIME
-static void
-fdt_map_efi_runtime(const char *prop, enum arm_efirt_mem_type type)
-{
- int len;
-
- const int chosen_off = fdt_path_offset(fdt_data, "/chosen");
- if (chosen_off < 0)
- return;
-
- const uint64_t *map = fdt_getprop(fdt_data, chosen_off, prop, &len);
- if (map == NULL)
- return;
-
- while (len >= 24) {
- const paddr_t pa = be64toh(map[0]);
- const vaddr_t va = be64toh(map[1]);
- const size_t sz = be64toh(map[2]);
- VPRINTF("%s: %s %#" PRIxPADDR "-%#" PRIxVADDR " (%#" PRIxVADDR
- "-%#" PRIxVSIZE ")\n", __func__, prop, pa, pa + sz - 1,
- va, va + sz - 1);
- arm_efirt_md_map_range(va, pa, sz, type);
- map += 3;
- len -= 24;
- }
-}
-#endif
vaddr_t
initarm(void *arg)
@@ -604,11 +366,11 @@ initarm(void *arg)
PRIx64 ")\n", __func__, memory_start, memory_end, memory_size);
/* Parse ramdisk info */
- fdt_probe_initrd(&initrd_start, &initrd_end);
+ fdt_probe_initrd();
/* Parse our on-disk rndseed and the firmware's RNG from EFI */
- fdt_probe_rndseed(&rndseed_start, &rndseed_end);
- fdt_probe_efirng(&efirng_start, &efirng_end);
+ fdt_probe_rndseed();
+ fdt_probe_efirng();
fdt_memory_remove_reserved(memory_start, memory_end);
Index: src/sys/dev/fdt/fdt_boot.c
diff -u src/sys/dev/fdt/fdt_boot.c:1.1 src/sys/dev/fdt/fdt_boot.c:1.2
--- src/sys/dev/fdt/fdt_boot.c:1.1 Sat Apr 22 09:53:45 2023
+++ src/sys/dev/fdt/fdt_boot.c Mon Jul 10 07:00:12 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: fdt_boot.c,v 1.1 2023/04/22 09:53:45 skrll Exp $ */
+/* $NetBSD: fdt_boot.c,v 1.2 2023/07/10 07:00:12 rin Exp $ */
/*-
* Copyright (c) 2015-2017 Jared McNeill <jmcne...@invisible.ca>
@@ -56,16 +56,307 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fdt_boot.c,v 1.1 2023/04/22 09:53:45 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fdt_boot.c,v 1.2 2023/07/10 07:00:12 rin Exp $");
+
+#include "opt_efi.h"
+#include "opt_md.h"
#include <sys/param.h>
+#include <sys/disk.h>
+#include <sys/disklabel.h>
+#include <sys/fcntl.h>
+#include <sys/md5.h>
#include <sys/optstr.h>
+#include <sys/rnd.h>
+#include <sys/rndsource.h>
+#include <sys/uuid.h>
+#include <sys/vnode.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+
+#include <uvm/uvm_extern.h>
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
#include <dev/fdt/fdt_boot.h>
+#if 0
+#include <dev/fdt/fdt_ddb.h>
+#endif
+#include <dev/fdt/fdt_memory.h>
+
+#ifdef EFI_RUNTIME
+#include <machine/efirt.h>
+
+void fdt_map_efi_runtime(const char *, enum cpu_efirt_mem_type);
+
+#endif
+
+#ifdef MEMORY_DISK_DYNAMIC
+#include <dev/md.h>
+
+static uint64_t initrd_start, initrd_end;
+#endif
+
+static uint64_t rndseed_start, rndseed_end; /* our on-disk seed */
+static uint64_t efirng_start, efirng_end; /* firmware's EFI RNG output */
+static struct krndsource efirng_source;
+
+
+static void
+fdt_probe_range(const char *startname, const char *endname,
+ uint64_t *pstart, uint64_t *pend)
+{
+ int chosen, len;
+ const void *start_data, *end_data;
+
+ *pstart = *pend = 0;
+
+ chosen = OF_finddevice("/chosen");
+ if (chosen < 0)
+ return;
+
+ start_data = fdtbus_get_prop(chosen, startname, &len);
+ end_data = fdtbus_get_prop(chosen, endname, NULL);
+ if (start_data == NULL || end_data == NULL)
+ return;
+
+ switch (len) {
+ case 4:
+ *pstart = be32dec(start_data);
+ *pend = be32dec(end_data);
+ break;
+ case 8:
+ *pstart = be64dec(start_data);
+ *pend = be64dec(end_data);
+ break;
+ default:
+ printf("Unsupported len %d for /chosen `%s'\n",
+ len, startname);
+ return;
+ }
+}
+
+
+static void *
+fdt_map_range(uint64_t start, uint64_t end, uint64_t *psize,
+ const char *purpose)
+{
+ const paddr_t startpa = trunc_page(start);
+ const paddr_t endpa = round_page(end);
+ paddr_t pa;
+ vaddr_t va;
+ void *ptr;
+
+ *psize = end - start;
+ if (*psize == 0)
+ return NULL;
+
+ const vaddr_t voff = start & PAGE_MASK;
+
+ // XXX NH add an align so map_chunk works betterer?
+ va = uvm_km_alloc(kernel_map, *psize, 0, UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
+ if (va == 0) {
+ printf("Failed to allocate VA for %s\n", purpose);
+ return NULL;
+ }
+ ptr = (void *)(va + voff);
+
+ // XXX NH map chunk
+ for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE)
+ pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
+ pmap_update(pmap_kernel());
+
+ return ptr;
+}
+
+static void
+fdt_unmap_range(void *ptr, uint64_t size)
+{
+ const char *start = ptr, *end = start + size;
+ const vaddr_t startva = trunc_page((vaddr_t)(uintptr_t)start);
+ const vaddr_t endva = round_page((vaddr_t)(uintptr_t)end);
+ const vsize_t sz = endva - startva;
+
+ pmap_kremove(startva, sz);
+ pmap_update(pmap_kernel());
+
+ uvm_km_free(kernel_map, startva, sz, UVM_KMF_VAONLY);
+}
+
+void
+fdt_probe_initrd(void)
+{
+
+#ifdef MEMORY_DISK_DYNAMIC
+ fdt_probe_range("linux,initrd-start", "linux,initrd-end",
+ &initrd_start, &initrd_end);
+#endif
+}
+
+void
+fdt_setup_initrd(void)
+{
+#ifdef MEMORY_DISK_DYNAMIC
+ void *md_start;
+ uint64_t initrd_size;
+
+ md_start = fdt_map_range(initrd_start, initrd_end, &initrd_size,
+ "initrd");
+ if (md_start == NULL)
+ return;
+ md_root_setconf(md_start, initrd_size);
+#endif
+}
+
+void
+fdt_reserve_initrd(void)
+{
+#ifdef MEMORY_DISK_DYNAMIC
+ const uint64_t initrd_size =
+ round_page(initrd_end) - trunc_page(initrd_start);
+
+ if (initrd_size > 0)
+ fdt_memory_remove_range(trunc_page(initrd_start), initrd_size);
+#endif
+}
+
+void
+fdt_probe_rndseed(void)
+{
+
+ fdt_probe_range("netbsd,rndseed-start", "netbsd,rndseed-end",
+ &rndseed_start, &rndseed_end);
+}
+
+void
+fdt_setup_rndseed(void)
+{
+ uint64_t rndseed_size;
+ void *rndseed;
+
+ rndseed = fdt_map_range(rndseed_start, rndseed_end, &rndseed_size,
+ "rndseed");
+ if (rndseed == NULL)
+ return;
+ rnd_seed(rndseed, rndseed_size);
+ fdt_unmap_range(rndseed, rndseed_size);
+}
+
+void
+fdt_reserve_rndseed(void)
+{
+ const uint64_t rndseed_size =
+ round_page(rndseed_end) - trunc_page(rndseed_start);
+
+ if (rndseed_size > 0)
+ fdt_memory_remove_range(trunc_page(rndseed_start),
+ rndseed_size);
+}
+
+void
+fdt_probe_efirng(void)
+{
+
+ fdt_probe_range("netbsd,efirng-start", "netbsd,efirng-end",
+ &efirng_start, &efirng_end);
+}
+
+void
+fdt_setup_efirng(void)
+{
+ uint64_t efirng_size;
+ void *efirng;
+
+ efirng = fdt_map_range(efirng_start, efirng_end, &efirng_size,
+ "efirng");
+ if (efirng == NULL)
+ return;
+
+ rnd_attach_source(&efirng_source, "efirng", RND_TYPE_RNG,
+ RND_FLAG_DEFAULT);
+
+ /*
+ * We don't really have specific information about the physical
+ * process underlying the data provided by the firmware via the
+ * EFI RNG API, so the entropy estimate here is heuristic.
+ * What efiboot provides us is up to 4096 bytes of data from
+ * the EFI RNG API, although in principle it may return short.
+ *
+ * The UEFI Specification (2.8 Errata A, February 2020[1]) says
+ *
+ * When a Deterministic Random Bit Generator (DRBG) is
+ * used on the output of a (raw) entropy source, its
+ * security level must be at least 256 bits.
+ *
+ * It's not entirely clear whether `it' refers to the DRBG or
+ * the entropy source; if it refers to the DRBG, it's not
+ * entirely clear how ANSI X9.31 3DES, one of the options for
+ * DRBG in the UEFI spec, can provide a `256-bit security
+ * level' because it has only 232 bits of inputs (three 56-bit
+ * keys and one 64-bit block). That said, even if it provides
+ * only 232 bits of entropy, that's enough to prevent all
+ * attacks and we probably get a few more bits from sampling
+ * the clock anyway.
+ *
+ * In the event we get raw samples, e.g. the bits sampled by a
+ * ring oscillator, we hope that the samples have at least half
+ * a bit of entropy per bit of data -- and efiboot tries to
+ * draw 4096 bytes to provide plenty of slop. Hence we divide
+ * the total number of bits by two and clamp at 256. There are
+ * ways this could go wrong, but on most machines it should
+ * behave reasonably.
+ *
+ * [1] https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_A_Feb14.pdf
+ */
+ rnd_add_data(&efirng_source, efirng, efirng_size,
+ MIN(256, efirng_size*NBBY/2));
+
+ explicit_memset(efirng, 0, efirng_size);
+ fdt_unmap_range(efirng, efirng_size);
+}
+
+void
+fdt_reserve_efirng(void)
+{
+ const uint64_t efirng_size =
+ round_page(efirng_end) - trunc_page(efirng_start);
+
+ if (efirng_size > 0)
+ fdt_memory_remove_range(trunc_page(efirng_start), efirng_size);
+}
+
+#ifdef EFI_RUNTIME
+void
+fdt_map_efi_runtime(const char *prop, enum cpu_efirt_mem_type type)
+{
+ int len;
+
+ const int chosen_off = fdt_path_offset(fdtbus_get_data(), "/chosen");
+ if (chosen_off < 0)
+ return;
+
+ const uint64_t *map = fdt_getprop(fdtbus_get_data(), chosen_off, prop, &len);
+ if (map == NULL)
+ return;
+
+ while (len >= 24) {
+ const paddr_t pa = be64toh(map[0]);
+ const vaddr_t va = be64toh(map[1]);
+ const size_t sz = be64toh(map[2]);
+#if 0
+ VPRINTF("%s: %s %#" PRIxPADDR "-%#" PRIxVADDR " (%#" PRIxVADDR
+ "-%#" PRIxVSIZE ")\n", __func__, prop, pa, pa + sz - 1,
+ va, va + sz - 1);
+#endif
+ cpu_efirt_map_range(va, pa, sz, type);
+ map += 3;
+ len -= 24;
+ }
+}
+#endif
void
fdt_update_stdout_path(void *fdt, const char *boot_args)
Index: src/sys/dev/fdt/fdt_boot.h
diff -u src/sys/dev/fdt/fdt_boot.h:1.1 src/sys/dev/fdt/fdt_boot.h:1.2
--- src/sys/dev/fdt/fdt_boot.h:1.1 Sat Apr 22 09:53:45 2023
+++ src/sys/dev/fdt/fdt_boot.h Mon Jul 10 07:00:12 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: fdt_boot.h,v 1.1 2023/04/22 09:53:45 skrll Exp $ */
+/* $NetBSD: fdt_boot.h,v 1.2 2023/07/10 07:00:12 rin Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -32,6 +32,22 @@
#ifndef _DEV_FDT_FDT_BOOT_H_
#define _DEV_FDT_FDT_BOOT_H_
+#ifdef EFI_RUNTIME
+#include <machine/efirt.h>
+
+void fdt_map_efi_runtime(const char *prop, enum cpu_efirt_mem_type type);
+#endif
+
+void fdt_probe_initrd(void);
+void fdt_setup_initrd(void);
+void fdt_reserve_initrd(void);
+void fdt_probe_rndseed(void);
+void fdt_setup_rndseed(void);
+void fdt_reserve_rndseed(void);
+void fdt_probe_efirng(void);
+void fdt_setup_efirng(void);
+void fdt_reserve_efirng(void);
+
void fdt_update_stdout_path(void *, const char *);
#endif /* _DEV_FDT_FDT_BOOT_H_ */
Added files:
Index: src/sys/arch/arm/include/efirt.h
diff -u /dev/null src/sys/arch/arm/include/efirt.h:1.1
--- /dev/null Mon Jul 10 07:00:12 2023
+++ src/sys/arch/arm/include/efirt.h Mon Jul 10 07:00:12 2023
@@ -0,0 +1,13 @@
+#ifndef _ARM_EFIRT_H_
+#define _ARM_EFIRT_H_
+
+
+enum cpu_efirt_mem_type {
+ ARM_EFIRT_MEM_CODE,
+ ARM_EFIRT_MEM_DATA,
+ ARM_EFIRT_MEM_MMIO,
+};
+
+void cpu_efirt_map_range(vaddr_t, paddr_t, size_t, enum cpu_efirt_mem_type);
+
+#endif
Index: src/sys/arch/evbarm/include/efirt.h
diff -u /dev/null src/sys/arch/evbarm/include/efirt.h:1.1
--- /dev/null Mon Jul 10 07:00:12 2023
+++ src/sys/arch/evbarm/include/efirt.h Mon Jul 10 07:00:12 2023
@@ -0,0 +1,3 @@
+/* $NetBSD: efirt.h,v 1.1 2023/07/10 07:00:12 rin Exp $ */
+
+#include <arm/efirt.h>
