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fw_cfg: add a public uapi header

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Create a common header file for well-known values and structures to be
shared by the Linux kernel with qemu or other projects.

It is based from qemu/docs/specs/fw_cfg.txt which references
qemu/include/hw/nvram/fw_cfg_keys.h "for the most up-to-date and
authoritative list" & vmcoreinfo.txt. Those files don't have an
explicit license, but qemu/hw/nvram/fw_cfg.c is BSD-license, so
Michael S. Tsirkin suggested to use the same license.

The patch intentionally left out DMA & vmcoreinfo structures &
defines, which are added in the commits making usage of it.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau
2018-02-28 16:06:11 +01:00
committed by Michael S. Tsirkin
parent b1cc4097d1
commit 1f57bc12d8
3 changed files with 69 additions and 20 deletions
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22
drivers/firmware/qemu_fw_cfg.c
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@@ -32,30 +32,12 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <uapi/linux/qemu_fw_cfg.h>
MODULE_AUTHOR("Gabriel L. Somlo <somlo@cmu.edu>");
MODULE_DESCRIPTION("QEMU fw_cfg sysfs support");
MODULE_LICENSE("GPL");
/* selector key values for "well-known" fw_cfg entries */
#define FW_CFG_SIGNATURE 0x00
#define FW_CFG_ID 0x01
#define FW_CFG_FILE_DIR 0x19
/* size in bytes of fw_cfg signature */
#define FW_CFG_SIG_SIZE 4
/* fw_cfg "file name" is up to 56 characters (including terminating nul) */
#define FW_CFG_MAX_FILE_PATH 56
/* fw_cfg file directory entry type */
struct fw_cfg_file {
u32 size;
u16 select;
u16 reserved;
char name[FW_CFG_MAX_FILE_PATH];
};
/* fw_cfg device i/o register addresses */
static bool fw_cfg_is_mmio;
static phys_addr_t fw_cfg_p_base;
@@ -616,7 +598,7 @@ MODULE_DEVICE_TABLE(of, fw_cfg_sysfs_mmio_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id fw_cfg_sysfs_acpi_match[] = {
{ "QEMU0002", },
{ FW_CFG_ACPI_DEVICE_ID, },
{},
};
MODULE_DEVICE_TABLE(acpi, fw_cfg_sysfs_acpi_match);