33bc892778
Separate coreboot related functions to coreboot_table.c to provide common methods for other firmware drivers. BUG=chrome-os-partner:39945 TEST=`emerge-oak chromeos-kernel-3_18` Signed-off-by: Wei-Ning Huang <wnhuang@google.com> Reviewed-on: https://chromium-review.googlesource.com/285380 Reviewed-by: Daniel Kurtz <djkurtz@chromium.org> Commit-Queue: Wei-Ning Huang <wnhuang@chromium.org> Tested-by: Wei-Ning Huang <wnhuang@chromium.org> (cherry picked from commit cc27c869c48c80ec7d89629f6cf112ef89818c78) Change-Id: Ie71f246d958c77b0721918167933de026d161bcb Reviewed-on: https://chromium-review.googlesource.com/294777 Reviewed-by: Yuji Sasaki <sasakiy@google.com> Reviewed-by: Wei-Ning Huang <wnhuang@chromium.org> Commit-Queue: Yuji Sasaki <sasakiy@google.com> Tested-by: Yuji Sasaki <sasakiy@google.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* memconsole.c
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*
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* Architecture-independent parts of the memory based BIOS console.
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*
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* Copyright 2014 Google Inc.
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*/
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#include <linux/init.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include "memconsole.h"
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static char *memconsole_baseaddr;
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static size_t memconsole_length;
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static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
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struct bin_attribute *bin_attr, char *buf,
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loff_t pos, size_t count)
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{
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return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
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memconsole_length);
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}
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static struct bin_attribute memconsole_bin_attr = {
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.attr = {.name = "log", .mode = 0444},
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.read = memconsole_read,
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};
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/* CBMEM firmware console log descriptor. */
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struct cbmem_cons {
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u32 buffer_size;
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u32 buffer_cursor;
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u8 buffer_body[0];
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} __packed;
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static struct cbmem_cons __iomem *cbmem_console;
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void memconsole_setup(void *baseaddr, size_t length)
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{
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memconsole_baseaddr = baseaddr;
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memconsole_length = length;
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}
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EXPORT_SYMBOL(memconsole_setup);
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int memconsole_coreboot_init(phys_addr_t physaddr)
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{
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struct cbmem_cons __iomem *tmp_cbmc;
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tmp_cbmc = ioremap_cache(physaddr, sizeof(*tmp_cbmc));
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if (tmp_cbmc == NULL)
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return -ENOMEM;
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cbmem_console = ioremap_cache(physaddr, tmp_cbmc->buffer_size +
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sizeof(*cbmem_console)); /* Don't forget counting the header. */
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iounmap(tmp_cbmc);
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if (cbmem_console == NULL)
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return -ENOMEM;
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memconsole_setup(cbmem_console->buffer_body,
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min(cbmem_console->buffer_cursor, cbmem_console->buffer_size));
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return 0;
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}
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EXPORT_SYMBOL(memconsole_coreboot_init);
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int memconsole_sysfs_init(void)
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{
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memconsole_bin_attr.size = memconsole_length;
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return sysfs_create_bin_file(firmware_kobj,
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&memconsole_bin_attr);
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}
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EXPORT_SYMBOL(memconsole_sysfs_init);
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void memconsole_exit(void)
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{
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if (cbmem_console)
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iounmap(cbmem_console);
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sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
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}
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EXPORT_SYMBOL(memconsole_exit);
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