From 1fb6841aa15407dbf371589d7abca7bc2d35815c Mon Sep 17 00:00:00 2001 Message-Id: <1fb6841aa15407dbf371589d7abca7bc2d35815c.1431592766.git.panand@redhat.com> From: Geoff Levand Date: Fri, 17 Apr 2015 10:54:55 -0700 Subject: [PATCH 01/17] kexec: Add common device tree routines Signed-off-by: Geoff Levand --- kexec/Makefile | 4 ++ kexec/dt-ops.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ kexec/dt-ops.h | 13 ++++++ 3 files changed, 153 insertions(+) create mode 100644 kexec/dt-ops.c create mode 100644 kexec/dt-ops.h diff --git a/kexec/Makefile b/kexec/Makefile index a758b4aae13a..6937a4dbb38b 100644 --- a/kexec/Makefile +++ b/kexec/Makefile @@ -69,6 +69,10 @@ dist += kexec/fs2dt.c kexec/fs2dt.h $(ARCH)_FS2DT = KEXEC_SRCS += $($(ARCH)_FS2DT) +dist += kexec/dt-ops.c kexec/dt-ops.h +$(ARCH)_DT_OPS = +KEXEC_SRCS += $($(ARCH)_DT_OPS) + include $(srcdir)/kexec/arch/alpha/Makefile include $(srcdir)/kexec/arch/arm/Makefile include $(srcdir)/kexec/arch/i386/Makefile diff --git a/kexec/dt-ops.c b/kexec/dt-ops.c new file mode 100644 index 000000000000..bbba986cfbb4 --- /dev/null +++ b/kexec/dt-ops.c @@ -0,0 +1,136 @@ +#include +#include +#include +#include +#include +#include + +#include "kexec.h" +#include "dt-ops.h" + +static const char n_chosen[] = "/chosen"; + +static const char p_bootargs[] = "bootargs"; +static const char p_initrd_start[] = "linux,initrd-start"; +static const char p_initrd_end[] = "linux,initrd-end"; + +int dtb_set_initrd(char **dtb, off_t *dtb_size, off_t start, off_t end) +{ + int result; + uint64_t value; + + dbgprintf("%s: start %jd, end %jd, size %jd (%jd KiB)\n", + __func__, (intmax_t)start, (intmax_t)end, + (intmax_t)(end - start), + (intmax_t)(end - start) / 1024); + + value = cpu_to_fdt64(start); + + result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_start, + &value, sizeof(value)); + + if (result) + return result; + + value = cpu_to_fdt64(end); + + result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_end, + &value, sizeof(value)); + + if (result) { + dtb_delete_property(*dtb, n_chosen, p_initrd_start); + return result; + } + + return 0; +} + +int dtb_set_bootargs(char **dtb, off_t *dtb_size, const char *command_line) +{ + return dtb_set_property(dtb, dtb_size, n_chosen, p_bootargs, + command_line, strlen(command_line) + 1); +} + +int dtb_set_property(char **dtb, off_t *dtb_size, const char *node, + const char *prop, const void *value, int value_len) +{ + int result; + int nodeoffset; + void *new_dtb; + int new_size; + + value_len = FDT_TAGALIGN(value_len); + + new_size = FDT_TAGALIGN(*dtb_size + fdt_node_len(node) + + fdt_prop_len(prop, value_len)); + + new_dtb = malloc(new_size); + + if (!new_dtb) { + dbgprintf("%s: malloc failed\n", __func__); + return -ENOMEM; + } + + result = fdt_open_into(*dtb, new_dtb, new_size); + + if (result) { + dbgprintf("%s: fdt_open_into failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + + nodeoffset = fdt_path_offset(new_dtb, node); + + if (nodeoffset == -FDT_ERR_NOTFOUND) { + result = fdt_add_subnode(new_dtb, nodeoffset, node); + + if (result) { + dbgprintf("%s: fdt_add_subnode failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + } else if (nodeoffset < 0) { + dbgprintf("%s: fdt_path_offset failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + goto on_error; + } + + result = fdt_setprop(new_dtb, nodeoffset, prop, value, value_len); + + if (result) { + dbgprintf("%s: fdt_setprop failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + + free(*dtb); + + *dtb = new_dtb; + *dtb_size = new_size; + + return 0; + +on_error: + free(new_dtb); + return result; +} + +int dtb_delete_property(char *dtb, const char *node, const char *prop) +{ + int result; + int nodeoffset = fdt_path_offset(dtb, node); + + if (nodeoffset < 0) { + dbgprintf("%s: fdt_path_offset failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + return nodeoffset; + } + + result = fdt_delprop(dtb, nodeoffset, prop); + + if (result) + dbgprintf("%s: fdt_delprop failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + + return result; +} diff --git a/kexec/dt-ops.h b/kexec/dt-ops.h new file mode 100644 index 000000000000..e70d15d8ffbf --- /dev/null +++ b/kexec/dt-ops.h @@ -0,0 +1,13 @@ +#if !defined(KEXEC_DT_OPS_H) +#define KEXEC_DT_OPS_H + +#include + +int dtb_set_initrd(char **dtb, off_t *dtb_size, off_t start, off_t end); +int dtb_set_bootargs(char **dtb, off_t *dtb_size, const char *command_line); +int dtb_set_property(char **dtb, off_t *dtb_size, const char *node, + const char *prop, const void *value, int value_len); + +int dtb_delete_property(char *dtb, const char *node, const char *prop); + +#endif -- 2.1.0