ACPICA: OSL: Add portable file IO to improve portability

This patch adds portable file IO to generic OSL to improve the portability
of the applications.

A portable application may use different file IO interfaces than the
standard C library ones. This patch thus introduces an abstract file IO
layer into the generic OSL.

Note that this patch does not introduce users of such interfaces, further
patches should introduce users one by one carefully with build tests
performed. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 40 insertions, 0 deletions

diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index f6f5f8af2112..03b3e6d405ff 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -399,4 +399,35 @@ char *acpi_os_get_next_filename(void *dir_handle);
 void acpi_os_close_directory(void *dir_handle);
 #endif
 
+/*
+ * File I/O and related support
+ */
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_open_file
+ACPI_FILE acpi_os_open_file(const char *path, u8 modes);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_close_file
+void acpi_os_close_file(ACPI_FILE file);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_read_file
+int
+acpi_os_read_file(ACPI_FILE file,
+                  void *buffer, acpi_size size, acpi_size count);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_write_file
+int
+acpi_os_write_file(ACPI_FILE file,
+                   void *buffer, acpi_size size, acpi_size count);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_file_offset
+long acpi_os_get_file_offset(ACPI_FILE file);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_set_file_offset
+acpi_status acpi_os_set_file_offset(ACPI_FILE file, long offset, u8 from);
+#endif
+
 #endif                          /* __ACPIOSXF_H__ */
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 19b26bb69a70..5480209b4254 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1244,4 +1244,13 @@ struct acpi_memory_list {
 #define ACPI_OSI_WIN_7                  0x0B
 #define ACPI_OSI_WIN_8                  0x0C
 
+/* Definitions of file IO */
+
+#define ACPI_FILE_READING               0x01
+#define ACPI_FILE_WRITING               0x02
+#define ACPI_FILE_BINARY                0x04
+
+#define ACPI_FILE_BEGIN                 0x01
+#define ACPI_FILE_END                   0x02
+
 #endif                          /* __ACTYPES_H__ */