aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorGrant Likely <grant.likely@secretlab.ca>2012-03-02 11:56:38 +0000
committerPeter Maydell <peter.maydell@linaro.org>2012-03-02 11:56:38 +0000
commit412beee6a0349ce430920e2b2faa8009ced4a672 (patch)
treea45532e27595b703ab6e8106b52a0ba4ab4cb95e
parent41c1e2f54e6fc76dbc7047f1a95693f4d37b4623 (diff)
arm: add device tree support
If compiled with CONFIG_FDT, allow user to specify a device tree file using the -dtb argument. If the machine supports it then the dtb will be loaded into memory and passed to the kernel on boot. Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> [Peter Maydell: Use machine opt rather than global to pass dtb filename] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--Makefile.target1
-rwxr-xr-xconfigure1
-rw-r--r--hw/arm-misc.h1
-rw-r--r--hw/arm_boot.c102
-rw-r--r--qemu-config.c4
-rw-r--r--qemu-options.hx9
-rw-r--r--vl.c8
7 files changed, 120 insertions, 6 deletions
diff --git a/Makefile.target b/Makefile.target
index 68a5641..6a56b3e 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -373,6 +373,7 @@ obj-arm-y += vexpress.o
obj-arm-y += strongarm.o
obj-arm-y += collie.o
obj-arm-y += pl041.o lm4549.o
+obj-arm-$(CONFIG_FDT) += device_tree.o
obj-sh4-y = shix.o r2d.o sh7750.o sh7750_regnames.o tc58128.o
obj-sh4-y += sh_timer.o sh_serial.o sh_intc.o sh_pci.o sm501.o
diff --git a/configure b/configure
index fb0e18e..7e69ea8 100755
--- a/configure
+++ b/configure
@@ -3485,6 +3485,7 @@ case "$target_arch2" in
gdb_xml_files="arm-core.xml arm-vfp.xml arm-vfp3.xml arm-neon.xml"
target_phys_bits=32
target_llong_alignment=4
+ target_libs_softmmu="$fdt_libs"
;;
cris)
target_nptl="yes"
diff --git a/hw/arm-misc.h b/hw/arm-misc.h
index 306013a..734bd82 100644
--- a/hw/arm-misc.h
+++ b/hw/arm-misc.h
@@ -29,6 +29,7 @@ struct arm_boot_info {
const char *kernel_filename;
const char *kernel_cmdline;
const char *initrd_filename;
+ const char *dtb_filename;
target_phys_addr_t loader_start;
/* multicore boards that use the default secondary core boot functions
* need to put the address of the secondary boot code, the boot reg,
diff --git a/hw/arm_boot.c b/hw/arm_boot.c
index 2ef25ca..fc66910 100644
--- a/hw/arm_boot.c
+++ b/hw/arm_boot.c
@@ -7,11 +7,14 @@
* This code is licensed under the GPL.
*/
+#include "config.h"
#include "hw.h"
#include "arm-misc.h"
#include "sysemu.h"
+#include "boards.h"
#include "loader.h"
#include "elf.h"
+#include "device_tree.h"
#define KERNEL_ARGS_ADDR 0x100
#define KERNEL_LOAD_ADDR 0x00010000
@@ -208,6 +211,67 @@ static void set_kernel_args_old(const struct arm_boot_info *info)
}
}
+static int load_dtb(target_phys_addr_t addr, const struct arm_boot_info *binfo)
+{
+#ifdef CONFIG_FDT
+ uint32_t mem_reg_property[] = { cpu_to_be32(binfo->loader_start),
+ cpu_to_be32(binfo->ram_size) };
+ void *fdt = NULL;
+ char *filename;
+ int size, rc;
+
+ filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, binfo->dtb_filename);
+ if (!filename) {
+ fprintf(stderr, "Couldn't open dtb file %s\n", binfo->dtb_filename);
+ return -1;
+ }
+
+ fdt = load_device_tree(filename, &size);
+ if (!fdt) {
+ fprintf(stderr, "Couldn't open dtb file %s\n", filename);
+ g_free(filename);
+ return -1;
+ }
+ g_free(filename);
+
+ rc = qemu_devtree_setprop(fdt, "/memory", "reg", mem_reg_property,
+ sizeof(mem_reg_property));
+ if (rc < 0) {
+ fprintf(stderr, "couldn't set /memory/reg\n");
+ }
+
+ rc = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs",
+ binfo->kernel_cmdline);
+ if (rc < 0) {
+ fprintf(stderr, "couldn't set /chosen/bootargs\n");
+ }
+
+ if (binfo->initrd_size) {
+ rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-start",
+ binfo->loader_start + INITRD_LOAD_ADDR);
+ if (rc < 0) {
+ fprintf(stderr, "couldn't set /chosen/linux,initrd-start\n");
+ }
+
+ rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-end",
+ binfo->loader_start + INITRD_LOAD_ADDR +
+ binfo->initrd_size);
+ if (rc < 0) {
+ fprintf(stderr, "couldn't set /chosen/linux,initrd-end\n");
+ }
+ }
+
+ cpu_physical_memory_write(addr, fdt, size);
+
+ return 0;
+
+#else
+ fprintf(stderr, "Device tree requested, "
+ "but qemu was compiled without fdt support\n");
+ return -1;
+#endif
+}
+
static void do_cpu_reset(void *opaque)
{
CPUState *env = opaque;
@@ -222,10 +286,12 @@ static void do_cpu_reset(void *opaque)
} else {
if (env == first_cpu) {
env->regs[15] = info->loader_start;
- if (old_param) {
- set_kernel_args_old(info);
- } else {
- set_kernel_args(info);
+ if (!info->dtb_filename) {
+ if (old_param) {
+ set_kernel_args_old(info);
+ } else {
+ set_kernel_args(info);
+ }
}
} else {
info->secondary_cpu_reset_hook(env, info);
@@ -243,6 +309,7 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
uint64_t elf_entry;
target_phys_addr_t entry;
int big_endian;
+ QemuOpts *machine_opts;
/* Load the kernel. */
if (!info->kernel_filename) {
@@ -250,6 +317,13 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
exit(1);
}
+ machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
+ if (machine_opts) {
+ info->dtb_filename = qemu_opt_get(machine_opts, "dtb");
+ } else {
+ info->dtb_filename = NULL;
+ }
+
if (!info->secondary_cpu_reset_hook) {
info->secondary_cpu_reset_hook = default_reset_secondary;
}
@@ -300,8 +374,25 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
} else {
initrd_size = 0;
}
+ info->initrd_size = initrd_size;
+
bootloader[4] = info->board_id;
- bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
+
+ /* for device tree boot, we pass the DTB directly in r2. Otherwise
+ * we point to the kernel args.
+ */
+ if (info->dtb_filename) {
+ /* Place the DTB after the initrd in memory */
+ target_phys_addr_t dtb_start = TARGET_PAGE_ALIGN(info->loader_start
+ + INITRD_LOAD_ADDR
+ + initrd_size);
+ if (load_dtb(dtb_start, info)) {
+ exit(1);
+ }
+ bootloader[5] = dtb_start;
+ } else {
+ bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
+ }
bootloader[6] = entry;
for (n = 0; n < sizeof(bootloader) / 4; n++) {
bootloader[n] = tswap32(bootloader[n]);
@@ -311,7 +402,6 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
if (info->nb_cpus > 1) {
info->write_secondary_boot(env, info);
}
- info->initrd_size = initrd_size;
}
info->is_linux = is_linux;
diff --git a/qemu-config.c b/qemu-config.c
index 7d9da78..be84a03 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -578,6 +578,10 @@ static QemuOptsList qemu_machine_opts = {
.name = "append",
.type = QEMU_OPT_STRING,
.help = "Linux kernel command line",
+ }, {
+ .name = "dtb",
+ .type = QEMU_OPT_STRING,
+ .help = "Linux kernel device tree file",
},
{ /* End of list */ }
},
diff --git a/qemu-options.hx b/qemu-options.hx
index b129996..e38799c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2037,6 +2037,15 @@ Use @var{file1} and @var{file2} as modules and pass arg=foo as parameter to the
first module.
ETEXI
+DEF("dtb", HAS_ARG, QEMU_OPTION_dtb, \
+ "-dtb file use 'file' as device tree image\n", QEMU_ARCH_ARM)
+STEXI
+@item -dtb @var{file}
+@findex -dtb
+Use @var{file} as a device tree binary (dtb) image and pass it to the kernel
+on boot.
+ETEXI
+
STEXI
@end table
ETEXI
diff --git a/vl.c b/vl.c
index 4a77696..97ab2b9 100644
--- a/vl.c
+++ b/vl.c
@@ -2527,6 +2527,9 @@ int main(int argc, char **argv, char **envp)
case QEMU_OPTION_append:
qemu_opts_set(qemu_find_opts("machine"), 0, "append", optarg);
break;
+ case QEMU_OPTION_dtb:
+ qemu_opts_set(qemu_find_opts("machine"), 0, "dtb", optarg);
+ break;
case QEMU_OPTION_cdrom:
drive_add(IF_DEFAULT, 2, optarg, CDROM_OPTS);
break;
@@ -3346,6 +3349,11 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
+ if (!linux_boot && machine_opts && qemu_opt_get(machine_opts, "dtb")) {
+ fprintf(stderr, "-dtb only allowed with -kernel option\n");
+ exit(1);
+ }
+
os_set_line_buffering();
if (init_timer_alarm() < 0) {