From 8df3191beed34f7cbfc0bfd4041c692f8b98d9a2 Mon Sep 17 00:00:00 2001
From: Matt Mower <mowerm@gmail.com>
Date: Wed, 9 Jul 2014 11:50:05 -0500
Subject: Allow custom bootloader msg offset in block misc

Globally define BOARD_RECOVERY_BLDRMSG_OFFSET with a decimal integer
to offset the read/write location in misc where the bootloader message
should appear. Example:

  BOARD_GLOBAL_CFLAGS := -DBOARD_RECOVERY_BLDRMSG_OFFSET=2048

Edify commands get_stage and set_stage need to be aware of the
custom bootloader msg offset because they write the stage directly
to the BCB.

Change-Id: Ifdb5ffe3e893a651be59ae63e3a0ebadd828c9f2
---
 Android.mk                                                         | 4 ----
 bootloader_message/bootloader_message.cpp                          | 5 ++++-
 bootloader_message/include/bootloader_message/bootloader_message.h | 5 +++++
 updater/install.cpp                                                | 3 +++
 4 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Android.mk b/Android.mk
index 8189ffae3..d6a318ba5 100644
--- a/Android.mk
+++ b/Android.mk
@@ -602,10 +602,6 @@ ifeq ($(AB_OTA_UPDATER),true)
     LOCAL_CFLAGS += -DAB_OTA_UPDATER=1
 endif
 
-ifneq ($(BOARD_RECOVERY_BLDRMSG_OFFSET),)
-    LOCAL_CFLAGS += -DBOARD_RECOVERY_BLDRMSG_OFFSET=$(BOARD_RECOVERY_BLDRMSG_OFFSET)
-endif
-
 include $(BUILD_SHARED_LIBRARY)
 
 # All the APIs for testing
diff --git a/bootloader_message/bootloader_message.cpp b/bootloader_message/bootloader_message.cpp
index 4d1ce5bb4..449f40e11 100644
--- a/bootloader_message/bootloader_message.cpp
+++ b/bootloader_message/bootloader_message.cpp
@@ -159,7 +159,10 @@ static bool write_misc_partition(const void* p, size_t size, size_t offset, std:
     *err = "no misc device set";
     return false;
   }
-  int fd = (open(misc_blk_device.c_str(), O_WRONLY | O_SYNC));
+  int open_flags = O_WRONLY | O_SYNC;
+  if (offset > 0)
+    open_flags = O_RDWR | O_APPEND | O_SYNC;
+  int fd = (open(misc_blk_device.c_str(), open_flags));
   if (fd == -1) {
     *err = "failed to open " + misc_blk_device + ": ";
     *err += strerror(errno);
diff --git a/bootloader_message/include/bootloader_message/bootloader_message.h b/bootloader_message/include/bootloader_message/bootloader_message.h
index 52d733105..e0fc2cd8a 100644
--- a/bootloader_message/include/bootloader_message/bootloader_message.h
+++ b/bootloader_message/include/bootloader_message/bootloader_message.h
@@ -25,8 +25,13 @@
 // 16K - 64K    Used by uncrypt and recovery to store wipe_package for A/B devices
 // Note that these offsets are admitted by bootloader,recovery and uncrypt, so they
 // are not configurable without changing all of them.
+#ifdef BOARD_RECOVERY_BLDRMSG_OFFSET
+static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = BOARD_RECOVERY_BLDRMSG_OFFSET;
+static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024 + BOOTLOADER_MESSAGE_OFFSET_IN_MISC;
+#else
 static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
 static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
+#endif
 
 /* Bootloader Message
  *
diff --git a/updater/install.cpp b/updater/install.cpp
index b17c34fb2..d4ae64ee5 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -1456,6 +1456,7 @@ Value* RebootNowFn(const char* name, State* state, int argc, Expr* argv[]) {
     memset(buffer, 0, sizeof(((struct bootloader_message*)0)->command));
     FILE* f = fopen(filename, "r+b");
     fseek(f, offsetof(struct bootloader_message, command), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     ota_fwrite(buffer, sizeof(((struct bootloader_message*)0)->command), 1, f);
     fclose(f);
     free(filename);
@@ -1498,6 +1499,7 @@ Value* SetStageFn(const char* name, State* state, int argc, Expr* argv[]) {
     // package installation.
     FILE* f = fopen(filename, "r+b");
     fseek(f, offsetof(struct bootloader_message, stage), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     int to_write = strlen(stagestr)+1;
     int max_size = sizeof(((struct bootloader_message*)0)->stage);
     if (to_write > max_size) {
@@ -1524,6 +1526,7 @@ Value* GetStageFn(const char* name, State* state, int argc, Expr* argv[]) {
     char buffer[sizeof(((struct bootloader_message*)0)->stage)];
     FILE* f = fopen(filename, "rb");
     fseek(f, offsetof(struct bootloader_message, stage), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     ota_fread(buffer, sizeof(buffer), 1, f);
     fclose(f);
     buffer[sizeof(buffer)-1] = '\0';
-- 
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