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Add kcmdline bootloader message

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Define a new struct in the misc partition for telling the bootloader to
set kcmdline flags for enabling experimental dogfood features in the
kernel.

Test: Verified that a custom bootloader is able to read the data
Bug: 278052745
Change-Id: I5f13a9bdff940517cb7b880815dfb8f396fc3844
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
This commit is contained in:
Alice Ryhl 2024-01-12 13:10:05 +00:00
parent f554b33bb9
commit a4aec2f2ce
2 changed files with 28 additions and 0 deletions
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10
bootloader_message/bootloader_message.cpp
View file

@ -314,6 +314,16 @@ bool WriteMiscMemtagMessage(const misc_memtag_message& message, std::string* err
offsetof(misc_system_space_layout, memtag_message), err);
}
bool ReadMiscKcmdlineMessage(misc_kcmdline_message* message, std::string* err) {
return ReadMiscPartitionSystemSpace(message, sizeof(*message),
offsetof(misc_system_space_layout, kcmdline_message), err);
}
bool WriteMiscKcmdlineMessage(const misc_kcmdline_message& message, std::string* err) {
return WriteMiscPartitionSystemSpace(&message, sizeof(message),
offsetof(misc_system_space_layout, kcmdline_message), err);
}
extern "C" bool write_reboot_bootloader(void) {
std::string err;
return write_reboot_bootloader(&err);

18
bootloader_message/include/bootloader_message/bootloader_message.h
View file

@ -100,6 +100,13 @@ struct misc_memtag_message {
uint8_t reserved[55];
} __attribute__((packed));
struct misc_kcmdline_message {
uint8_t version;
uint32_t magic;
uint64_t kcmdline_flags;
uint8_t reserved[51];
} __attribute__((packed));
#define MISC_VIRTUAL_AB_MESSAGE_VERSION 2
#define MISC_VIRTUAL_AB_MAGIC_HEADER 0x56740AB0
@ -116,11 +123,17 @@ struct misc_memtag_message {
// See system/extras/mtectrl in AOSP for more information.
#define MISC_MEMTAG_MODE_FORCED 0x20
#define MISC_KCMDLINE_MESSAGE_VERSION 1
#define MISC_KCMDLINE_MAGIC_HEADER 0x6ab5110c
#define MISC_KCMDLINE_BINDER_RUST 0x1
#if (__STDC_VERSION__ >= 201112L) || defined(__cplusplus)
static_assert(sizeof(struct misc_virtual_ab_message) == 64,
"struct misc_virtual_ab_message has wrong size");
static_assert(sizeof(struct misc_memtag_message) == 64,
"struct misc_memtag_message has wrong size");
static_assert(sizeof(struct misc_kcmdline_message) == 64,
"struct misc_kcmdline_message has wrong size");
#endif
// This struct is not meant to be used directly, rather, it is to make
@ -128,6 +141,7 @@ static_assert(sizeof(struct misc_memtag_message) == 64,
struct misc_system_space_layout {
misc_virtual_ab_message virtual_ab_message;
misc_memtag_message memtag_message;
misc_kcmdline_message kcmdline_message;
} __attribute__((packed));
#ifdef __cplusplus
@ -198,6 +212,10 @@ bool WriteMiscVirtualAbMessage(const misc_virtual_ab_message& message, std::stri
// Read or write the memtag message from system space in /misc.
bool ReadMiscMemtagMessage(misc_memtag_message* message, std::string* err);
bool WriteMiscMemtagMessage(const misc_memtag_message& message, std::string* err);
// Read or write the kcmdline message from system space in /misc.
bool ReadMiscKcmdlineMessage(misc_kcmdline_message* message, std::string* err);
bool WriteMiscKcmdlineMessage(const misc_kcmdline_message& message, std::string* err);
#else
#include <stdbool.h>