From 6fe0cab205e131525efbfce4f59da344b1e76598 Mon Sep 17 00:00:00 2001 From: Hung-Te Lin Date: Tue, 22 Jan 2013 18:57:56 +0800 Subject: Extend CBFS to support arbitrary ROM source media. Summary: Isolate CBFS underlying I/O to board/arch-specific implementations as "media stream", to allow loading and booting romstage on non-x86. CBFS functions now all take a new "media source" parameter; use CBFS_DEFAULT_MEDIA if you simply want to load from main firmware. API Changes: cbfs_find => cbfs_get_file. cbfs_find_file => cbfs_get_file_content. cbfs_get_file => cbfs_get_file_content with correct type. CBFS used to work only on memory-mapped ROM (all x86). For platforms like ARM, the ROM may come from USB, UART, or SPI -- any serial devices and not available for memory mapping. To support these devices (and allowing CBFS to read from multiple source at the same time), CBFS operations are now virtual-ized into "cbfs_media". To simplify porting existing code, every media source must support both "reading into pre-allocated memory (read)" and "read and return an allocated buffer (map)". For devices without native memory-mapped ROM, "cbfs_simple_buffer*" provides simple memory mapping simulation. Every CBFS function now takes a cbfs_media* as parameter. CBFS_DEFAULT_MEDIA is defined for CBFS functions to automatically initialize a per-board default media (CBFS will internally calls init_default_cbfs_media). Also revised CBFS function names relying on memory mapped backend (ex, "cbfs_find" => actually loads files). Now we only have two getters: struct cbfs_file *entry = cbfs_get_file(media, name); void *data = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, name, type); Test results: - Verified to work on x86/qemu. - Compiles on ARM, and follow up commit will provide working SPI driver. Change-Id: Iac911ded25a6f2feffbf3101a81364625bb07746 Signed-off-by: Hung-Te Lin Reviewed-on: http://review.coreboot.org/2182 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/drivers/pc80/mc146818rtc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'src/drivers/pc80/mc146818rtc.c') diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c index d8d1778b5c..5ffa9d7fc4 100644 --- a/src/drivers/pc80/mc146818rtc.c +++ b/src/drivers/pc80/mc146818rtc.c @@ -190,7 +190,8 @@ int get_option(void *dest, const char *name) namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); /* find the requested entry record */ - ct=cbfs_find_file("cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT); + ct = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, "cmos_layout.bin", + CBFS_COMPONENT_CMOS_LAYOUT); if (!ct) { printk(BIOS_ERR, "RTC: cmos_layout.bin could not be found. " "Options are disabled\n"); @@ -268,7 +269,8 @@ int set_option(const char *name, void *value) namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); /* find the requested entry record */ - ct=cbfs_find_file("cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT); + ct = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, "cmos_layout.bin", + CBFS_COMPONENT_CMOS_LAYOUT); if (!ct) { printk(BIOS_ERR, "cmos_layout.bin could not be found. Options are disabled\n"); return(-2); -- cgit v1.2.3