[SeaBIOS] [PATCH v2 2/2] QEMU fw_cfg: Add command to write back address of file
ben at skyportsystems.com
ben at skyportsystems.com
Fri Jan 20 23:33:16 CET 2017
From: Ben Warren <ben at skyportsystems.com>
The command allows the memory allocation of a fw_cfg file by BIOS and
subsequent return of the allocated address to QEMU.
Signed-off-by: Ben Warren <ben at skyportsystems.com>
---
src/fw/romfile_loader.c | 38 ++++++++++++++++++++++++++++++++++++++
src/fw/romfile_loader.h | 23 ++++++++++++++++++++---
2 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/src/fw/romfile_loader.c b/src/fw/romfile_loader.c
index f4b17ff..1b3fb3e 100644
--- a/src/fw/romfile_loader.c
+++ b/src/fw/romfile_loader.c
@@ -5,6 +5,7 @@
#include "romfile.h" // struct romfile_s
#include "malloc.h" // Zone*, _malloc
#include "output.h" // warn_*
+#include "paravirt.h" // qemu_cfg_write_file
struct romfile_loader_file {
struct romfile_s *file;
@@ -127,6 +128,38 @@ err:
warn_internalerror();
}
+static void romfile_loader_return_addr(struct romfile_loader_entry_s *entry,
+ struct romfile_loader_files *files)
+{
+ struct romfile_loader_file *alloc_file;
+ struct romfile_loader_file *addr_file;
+ u64 addr;
+ int ret;
+
+ alloc_file = romfile_loader_find(entry->alloc_ret_file, files);
+ addr_file = romfile_loader_find(entry->alloc_ret_addr_file, files);
+
+ if (!alloc_file || !addr_file || !alloc_file->data || !addr_file->data ||
+ addr_file->file->size < sizeof(addr))
+ goto err;
+
+ /* Get the address of the just-allocated file
+ * and stuff it in the address file */
+ void *data_ptr = alloc_file->data;
+
+ memcpy(&addr, &data_ptr, sizeof(data_ptr));
+ addr = cpu_to_le64(addr);
+ memcpy(addr_file->data, &addr, sizeof(addr));
+
+ /* Only supported on QEMU */
+ ret = qemu_cfg_write_file(&addr, addr_file->file, sizeof(addr));
+ if (ret != sizeof(addr))
+ goto err;
+ return;
+err:
+ warn_internalerror();
+}
+
int romfile_loader_execute(const char *name)
{
struct romfile_loader_entry_s *entry;
@@ -161,6 +194,11 @@ int romfile_loader_execute(const char *name)
break;
case ROMFILE_LOADER_COMMAND_ADD_CHECKSUM:
romfile_loader_add_checksum(entry, files);
+ break;
+ case ROMFILE_LOADER_COMMAND_ALLOCATE_RET_ADDR:
+ romfile_loader_allocate(entry, files);
+ romfile_loader_return_addr(entry, files);
+ break;
default:
/* Skip commands that we don't recognize. */
break;
diff --git a/src/fw/romfile_loader.h b/src/fw/romfile_loader.h
index 15eab2a..44a6cb8 100644
--- a/src/fw/romfile_loader.h
+++ b/src/fw/romfile_loader.h
@@ -51,15 +51,32 @@ struct romfile_loader_entry_s {
u32 cksum_length;
};
+ /*
+ * COMMAND_ALLOCATE_RETURN_ADDR - allocate a table from @alloc_file
+ * subject to @alloc_ret_align alignment (must be power of 2)
+ * and @alloc_ret_zone (can be HIGH or FSEG) requirements.
+ * Additionally, return the address of the allocation in
+ * @addr_file.
+ *
+ * This may be used instead of COMMAND_ALLOCATE
+ */
+ struct {
+ char alloc_ret_file[ROMFILE_LOADER_FILESZ];
+ u32 alloc_ret_align;
+ u8 alloc_ret_zone;
+ char alloc_ret_addr_file[ROMFILE_LOADER_FILESZ];
+ };
+
/* padding */
char pad[124];
};
};
enum {
- ROMFILE_LOADER_COMMAND_ALLOCATE = 0x1,
- ROMFILE_LOADER_COMMAND_ADD_POINTER = 0x2,
- ROMFILE_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
+ ROMFILE_LOADER_COMMAND_ALLOCATE = 0x1,
+ ROMFILE_LOADER_COMMAND_ADD_POINTER = 0x2,
+ ROMFILE_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
+ ROMFILE_LOADER_COMMAND_ALLOCATE_RET_ADDR = 0x4,
};
enum {
--
2.7.4
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