[Part1 PATCH v5 07/22] x86, ACPI: Store override acpi tables phys addr in cpio files info array

From: Tang Chen
Date: Thu Jun 13 2013 - 09:32:59 EST

From: Yinghai Lu <yinghai@xxxxxxxxxx>

This patch introduces a file_pos struct to store physaddr. And then changes
acpi_initrd_files[] to file_pos type. Then store physaddr of ACPI tables
in acpi_initrd_files[].

For finding, we will find ACPI tables with physaddr during 32bit flat mode
in head_32.S, because at that time we don't need to setup page table to
access initrd.

For copying, we could use early_ioremap() with physaddr directly before
memory mapping is set.

To keep 32bit and 64bit platforms consistent, use phys_addr for all.

-v2: introduce file_pos to save physaddr instead of abusing cpio_data
which tj is not happy with.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Tested-by: Thomas Renninger <trenn@xxxxxxx>
Reviewed-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Tested-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
drivers/acpi/osl.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 6ab6c54..42f79e3 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -570,7 +570,11 @@ static const char * const table_sigs[] = {
#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)

-static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
+struct file_pos {
+ phys_addr_t data;
+ phys_addr_t size;
+static struct file_pos __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];

void __init acpi_initrd_override_find(void *data, size_t size)
@@ -615,7 +619,7 @@ void __init acpi_initrd_override_find(void *data, size_t size)
table->signature, cpio_path, file.name, table->length);

all_tables_size += table->length;
- acpi_initrd_files[table_nr].data = file.data;
+ acpi_initrd_files[table_nr].data = __pa_nodebug(file.data);
acpi_initrd_files[table_nr].size = file.size;
@@ -624,7 +628,7 @@ void __init acpi_initrd_override_find(void *data, size_t size)
void __init acpi_initrd_override_copy(void)
int no, total_offset = 0;
- char *p;
+ char *p, *q;

if (!all_tables_size)
@@ -659,12 +663,15 @@ void __init acpi_initrd_override_copy(void)
* one by one during copying.
for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
+ phys_addr_t addr = acpi_initrd_files[no].data;
phys_addr_t size = acpi_initrd_files[no].size;

if (!size)
+ q = early_ioremap(addr, size);
p = early_ioremap(acpi_tables_addr + total_offset, size);
- memcpy(p, acpi_initrd_files[no].data, size);
+ memcpy(p, q, size);
+ early_iounmap(q, size);
early_iounmap(p, size);
total_offset += size;

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