The idea of the stickypage was to have a 4K memory region persistent
over resets. This region was implemented as mmap of a temporary hostfile,
which was created on first barebox start and maintained over resets.
Usability was a bit lacking however:
- The temporary files weren't deleted
- state always showed warnings and errors on first boot. The banner
telling users to ignore this wasn't best user experience
- In the same vein, the power driver had logic to handle a fresh
(zeroed) stickypage and interpret that as POR boot
We can avoid all that, by just shipping a default stickypage and
referencing that from DT. Do that.
Signed-off-by: Ahmad Fatoum <[email protected]>
---
v1 -> v2:
- compile stickypage at build time instead of shipping it in binary
form. Sascha reports issues with binary patche handling outside git.
---
.gitignore | 1 +
Makefile | 2 +-
arch/sandbox/Makefile | 7 ++
arch/sandbox/board/Makefile | 2 +
arch/sandbox/board/env/init/state | 13 ---
arch/sandbox/board/hostfile.c | 19 +++--
arch/sandbox/board/power.c | 2 -
arch/sandbox/board/stickypage.S | 26 ++++++
arch/sandbox/dts/sandbox.dts | 1 +
.../sandbox/mach-sandbox/include/mach/linux.h | 1 +
arch/sandbox/os/common.c | 83 ++++++++-----------
11 files changed, 86 insertions(+), 71 deletions(-)
delete mode 100644 arch/sandbox/board/env/init/state
create mode 100644 arch/sandbox/board/stickypage.S
diff --git a/.gitignore b/.gitignore
index d7a37b3c9b39..529bcfc2128e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,7 @@ Module.symvers
/TAGS
/barebox*
/System.map
+/stickypage.bin
#
# git files that we don't want to ignore even it they are dot-files
diff --git a/Makefile b/Makefile
index f3a1bcc04cdd..6715a44d1e9e 100644
--- a/Makefile
+++ b/Makefile
@@ -1123,7 +1123,7 @@ endif # CONFIG_MODULES
# Directories & files removed with 'make clean'
CLEAN_DIRS += $(MODVERDIR)
-CLEAN_FILES += barebox System.map include/generated/barebox_default_env.h \
+CLEAN_FILES += barebox System.map stickypage.bin
include/generated/barebox_default_env.h \
.tmp_version .tmp_barebox* barebox.bin barebox.map \
.tmp_kallsyms* barebox.ldr compile_commands.json \
scripts/bareboxenv-target barebox-flash-image \
diff --git a/arch/sandbox/Makefile b/arch/sandbox/Makefile
index 5fc7e227be67..ba2614ea5f44 100644
--- a/arch/sandbox/Makefile
+++ b/arch/sandbox/Makefile
@@ -75,3 +75,10 @@ common-y += $(BOARD) arch/sandbox/os/ arch/sandbox/lib/
common-$(CONFIG_OFTREE) += arch/sandbox/dts/
CLEAN_FILES += $(BOARD)/barebox.lds
+
+OBJCOPYFLAGS_stickypage.bin = -O binary
+
+stickypage.bin: arch/sandbox/board/stickypage.o
+ $(call if_changed,objcopy)
+
+all: stickypage.bin
diff --git a/arch/sandbox/board/Makefile b/arch/sandbox/board/Makefile
index ffb1dbc21ebf..59fece60ef50 100644
--- a/arch/sandbox/board/Makefile
+++ b/arch/sandbox/board/Makefile
@@ -10,3 +10,5 @@ obj-y += watchdog.o
obj-$(CONFIG_LED) += led.o
extra-y += barebox.lds
+
+extra-y += stickypage.o
diff --git a/arch/sandbox/board/env/init/state
b/arch/sandbox/board/env/init/state
deleted file mode 100644
index b8a2b42a53ea..000000000000
--- a/arch/sandbox/board/env/init/state
+++ /dev/null
@@ -1,13 +0,0 @@
-if [ "x$state.dirty" != "x1" -o $global.system.reset != "POR" ]; then
- exit
-fi
-
-source /env/data/ansi-colors
-
-echo -e $CYAN
-echo "*******************************************************"
-echo "*** Inconsistent barebox state buckets detected ***"
-echo "*** This is normal for a first boot ***"
-echo "*** barebox will repair them on next poweroff/reset ***"
-echo "*******************************************************"
-echo -e -n $NC
diff --git a/arch/sandbox/board/hostfile.c b/arch/sandbox/board/hostfile.c
index 0346590889ed..f11062197934 100644
--- a/arch/sandbox/board/hostfile.c
+++ b/arch/sandbox/board/hostfile.c
@@ -232,12 +232,21 @@ static int of_hostfile_map_fixup(struct device_node
*root, void *ctx)
for_each_compatible_node_from(node, root, NULL,
hostfile_dt_ids->compatible) {
struct hf_info hf = {};
uint64_t reg[2] = {};
- bool no_filename;
hf.devname = node->name;
ret = of_property_read_string(node, "barebox,filename",
&hf.filename);
- no_filename = ret;
+ if (ret) {
+ pr_err("skipping nameless hostfile %s\n", hf.devname);
+ continue;
+ }
+
+ if (memcmp(hf.filename, "$build/", 7) == 0) {
+ char *fullpath = xasprintf("%s/%s",
linux_get_builddir(),
+ hf.filename + sizeof
"$build/" - 1);
+
+ hf.filename = fullpath;
+ }
hf.is_blockdev = of_property_read_bool(node,
"barebox,blockdev");
hf.is_cdev = of_property_read_bool(node, "barebox,cdev");
@@ -263,12 +272,6 @@ static int of_hostfile_map_fixup(struct device_node *root,
void *ctx)
if (ret)
goto out;
- if (no_filename) {
- ret = of_property_write_string(node,
"barebox,filename", hf.filename);
- if (ret)
- goto out;
- }
-
ret = of_property_write_u32(node, "barebox,fd", hf.fd);
out:
if (ret)
diff --git a/arch/sandbox/board/power.c b/arch/sandbox/board/power.c
index 57801c8c3dc4..3112c80348e7 100644
--- a/arch/sandbox/board/power.c
+++ b/arch/sandbox/board/power.c
@@ -64,8 +64,6 @@ static int sandbox_power_probe(struct device_d *dev)
rst = nvmem_cell_read(power->reset_source_cell, &len);
if (!IS_ERR(rst)) {
- if (*rst == 0)
- *rst = RESET_POR;
reset_source_set_prinst(*rst, RESET_SOURCE_DEFAULT_PRIORITY, 0);
free(rst);
diff --git a/arch/sandbox/board/stickypage.S b/arch/sandbox/board/stickypage.S
new file mode 100644
index 000000000000..f1915ab986fd
--- /dev/null
+++ b/arch/sandbox/board/stickypage.S
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+.globl stickypage;
+stickypage:
+
+/* nvmem */ .org 0x300
+.byte 0x01
+
+/* env */ .org 0x400
+.byte 0x79, 0xba, 0x8f, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
+.byte 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x69, 0x9c, 0x7f,
0x00, 0x00, 0x00, 0x00
+
+/* state */ .org 0xC00
+.byte 0xf3, 0xfd, 0x54, 0x23, 0x18, 0x00, 0x00, 0x00, 0xa6, 0x86, 0x3b, 0xaa,
0x00, 0x00, 0x08, 0x00
+.byte 0x19, 0x70, 0x3d, 0xbb, 0x64, 0x89, 0x3b, 0x31, 0x01, 0x00, 0x00, 0x00,
0x03, 0x00, 0x00, 0x00
+.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
+.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
+.byte 0xf3, 0xfd, 0x54, 0x23, 0x18, 0x00, 0x00, 0x00, 0xa6, 0x86, 0x3b, 0xaa,
0x00, 0x00, 0x08, 0x00
+.byte 0x19, 0x70, 0x3d, 0xbb, 0x64, 0x89, 0x3b, 0x31, 0x01, 0x00, 0x00, 0x00,
0x03, 0x00, 0x00, 0x00
+.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
+.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
+.byte 0xf3, 0xfd, 0x54, 0x23, 0x18, 0x00, 0x00, 0x00, 0xa6, 0x86, 0x3b, 0xaa,
0x00, 0x00, 0x08, 0x00
+.byte 0x19, 0x70, 0x3d, 0xbb, 0x64, 0x89, 0x3b, 0x31, 0x01, 0x00, 0x00, 0x00,
0x03, 0x00, 0x00, 0x00
+
+.fill 4096-(.-stickypage), 1, 0
+.size stickypage, 4096
diff --git a/arch/sandbox/dts/sandbox.dts b/arch/sandbox/dts/sandbox.dts
index 595a1e8eae73..5b2cab219e2a 100644
--- a/arch/sandbox/dts/sandbox.dts
+++ b/arch/sandbox/dts/sandbox.dts
@@ -55,6 +55,7 @@
stickypage: stickypage {
compatible = "barebox,hostfile", "syscon", "simple-mfd";
+ barebox,filename = "$build/stickypage.bin";
reg = <0 0 0 4096>;
barebox,cdev; /* no caching allowed */
diff --git a/arch/sandbox/mach-sandbox/include/mach/linux.h
b/arch/sandbox/mach-sandbox/include/mach/linux.h
index 831e170d90ef..453813952e55 100644
--- a/arch/sandbox/mach-sandbox/include/mach/linux.h
+++ b/arch/sandbox/mach-sandbox/include/mach/linux.h
@@ -13,6 +13,7 @@ int linux_register_device(const char *name, void *start, void
*end);
int tap_alloc(const char *dev);
uint64_t linux_get_time(void);
int linux_open(const char *filename, int readwrite);
+const char *linux_get_builddir(void);
int linux_open_hostfile(struct hf_info *hf);
int linux_read(int fd, void *buf, size_t count);
int linux_read_nonblock(int fd, void *buf, size_t count);
diff --git a/arch/sandbox/os/common.c b/arch/sandbox/os/common.c
index 4eb6d37fffc1..e36e3972bc0d 100644
--- a/arch/sandbox/os/common.c
+++ b/arch/sandbox/os/common.c
@@ -127,9 +127,23 @@ void __attribute__((noreturn)) linux_exit(void)
exit(0);
}
-static size_t saved_argv_len;
static char **saved_argv;
+static int selfpath(char *buf, size_t len)
+{
+ int ret;
+
+ /* we must follow the symlink, so we can exec an updated executable */
+ ret = readlink("/proc/self/exe", buf, len - 1);
+ if (ret < 0)
+ return ret;
+
+ if (0 < ret && ret < len - 1)
+ buf[ret] = '\0';
+
+ return ret;
+}
+
void linux_reexec(void)
{
char buf[4097];
@@ -138,9 +152,8 @@ void linux_reexec(void)
cookmode();
/* we must follow the symlink, so we can exec an updated executable */
- ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
- if (0 < ret && ret < sizeof(buf) - 1) {
- buf[ret] = '\0';
+ ret = selfpath(buf, sizeof(buf));
+ if (ret > 0) {
execv(buf, saved_argv);
if (!strcmp(&buf[ret - DELETED_OFFSET], " (deleted)")) {
printf("barebox image on disk changed. Loading new.\n");
@@ -317,6 +330,21 @@ static int add_image(const char *_str, char
*devname_template, int *devname_numb
return ret;
}
+const char *linux_get_builddir(void)
+{
+ static char path[4097];
+ int ret;
+
+ if (!path[0]) {
+ ret = selfpath(path, sizeof(path));
+ if (ret < 0)
+ return NULL;
+ dirname(path);
+ }
+
+ return path;
+}
+
int linux_open_hostfile(struct hf_info *hf)
{
char *buf = NULL;
@@ -327,45 +355,10 @@ int linux_open_hostfile(struct hf_info *hf)
hf->filename ? "" : "initially un", hf->filename ?: "",
hf->is_readonly ? "(ro)" : "");
- if (hf->filename) {
- fd = hf->fd = open(hf->filename, (hf->is_readonly ? O_RDONLY :
O_RDWR) | O_CLOEXEC);
- } else {
- char *filename;
- int ret;
-
- ret = asprintf(&buf, "--image=%s=/tmp/barebox-hostfileXXXXXX",
hf->devname);
- if (ret < 0) {
- perror("asprintf");
- goto err_out;
- }
-
- filename = buf + strlen("--image==") + strlen(hf->devname);
-
- fd = hf->fd = mkstemp(filename);
- if (fd >= 0) {
- ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl");
- goto err_out;
- }
-
- ret = ftruncate(fd, hf->size);
- if (ret < 0) {
- perror("ftruncate");
- goto err_out;
- }
-
- hf->filename = filename;
-
- saved_argv = realloc(saved_argv,
- ++saved_argv_len *
sizeof(*saved_argv));
- if (!saved_argv)
- exit(1);
- saved_argv[saved_argv_len - 2] = buf;
- saved_argv[saved_argv_len - 1] = NULL;
- }
- }
+ if (!hf->filename)
+ return -ENOENT;
+ fd = hf->fd = open(hf->filename, (hf->is_readonly ? O_RDONLY : O_RDWR)
| O_CLOEXEC);
if (fd < 0) {
perror("open");
goto err_out;
@@ -517,11 +510,7 @@ int main(int argc, char *argv[])
}
}
- saved_argv_len = argc + 1;
- saved_argv = calloc(saved_argv_len, sizeof(*saved_argv));
- if (!saved_argv)
- exit(1);
- memcpy(saved_argv, argv, saved_argv_len * sizeof(*saved_argv));
+ saved_argv = argv;
ram = malloc(malloc_size);
if (!ram) {
--
2.30.2
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