diff options
Diffstat (limited to 'src/vendorcode/google/chromeos/vboot2/common.c')
| -rw-r--r-- | src/vendorcode/google/chromeos/vboot2/common.c | 75 |
1 files changed, 72 insertions, 3 deletions
diff --git a/src/vendorcode/google/chromeos/vboot2/common.c b/src/vendorcode/google/chromeos/vboot2/common.c index f6f5b96070..a33fb8e98e 100644 --- a/src/vendorcode/google/chromeos/vboot2/common.c +++ b/src/vendorcode/google/chromeos/vboot2/common.c @@ -21,14 +21,30 @@ #include <cbmem.h> #include <console/console.h> #include <reset.h> +#include <string.h> +#include <vb2_api.h> #include "../chromeos.h" #include "../symbols.h" #include "../vboot_handoff.h" #include "misc.h" +/* + * this is placed at the start of the vboot work buffer. selected_region is used + * for the verstage to return the location of the selected slot. buffer is used + * by the vboot2 core. Keep the struct cpu architecture agnostic as it crosses + * stage boundaries. + */ +struct vb2_working_data { + uint32_t selected_region_offset; + uint32_t selected_region_size; + /* offset of the buffer from the start of this struct */ + uint32_t buffer_offset; + uint32_t buffer_size; +}; + static const size_t vb_work_buf_size = 16 * KiB; -struct vb2_working_data * const vboot_get_working_data(void) +static struct vb2_working_data * const vboot_get_working_data(void) { if (IS_ENABLED(CONFIG_VBOOT_DYNAMIC_WORK_BUFFER)) /* cbmem_add() does a cbmem_find() first. */ @@ -37,7 +53,7 @@ struct vb2_working_data * const vboot_get_working_data(void) return (struct vb2_working_data *)_vboot2_work; } -size_t vb2_working_data_size(void) +static size_t vb2_working_data_size(void) { if (IS_ENABLED(CONFIG_VBOOT_DYNAMIC_WORK_BUFFER)) return vb_work_buf_size; @@ -45,7 +61,60 @@ size_t vb2_working_data_size(void) return _vboot2_work_size; } -void *vboot_get_work_buffer(struct vb2_working_data *wd) +void vb2_init_work_context(struct vb2_context *ctx) { + struct vb2_working_data *wd; + size_t work_size; + + /* First initialize the working data region. */ + work_size = vb2_working_data_size(); + wd = vboot_get_working_data(); + memset(wd, 0, work_size); + + /* + * vboot prefers 16-byte alignment. This takes away 16 bytes + * from the VBOOT2_WORK region, but the vboot devs said that's okay. + */ + wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16); + wd->buffer_size = work_size - wd->buffer_offset; + + /* Initialize the vb2_context. */ + memset(ctx, 0, sizeof(*ctx)); + ctx->workbuf = (void *)vb2_get_shared_data(); + ctx->workbuf_size = wd->buffer_size; + +} + +struct vb2_shared_data *vb2_get_shared_data(void) +{ + struct vb2_working_data *wd = vboot_get_working_data(); return (void *)((uintptr_t)wd + wd->buffer_offset); } + +int vb2_get_selected_region(struct region_device *rdev) +{ + const struct vb2_working_data *wd = vboot_get_working_data(); + struct region reg = { + .offset = wd->selected_region_offset, + .size = wd->selected_region_size, + }; + return vboot_region_device(®, rdev); +} + +void vb2_set_selected_region(struct region_device *rdev) +{ + struct vb2_working_data *wd = vboot_get_working_data(); + wd->selected_region_offset = region_device_offset(rdev); + wd->selected_region_size = region_device_sz(rdev); +} + +int vboot_is_slot_selected(void) +{ + const struct vb2_working_data *wd = vboot_get_working_data(); + return wd->selected_region_size > 0; +} + +int vboot_is_readonly_path(void) +{ + return !vboot_is_slot_selected(); +} |