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x86: acpi: Introduce a stub to generate CSRT

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Here is a stub function that generates an empty CSRT. If the target platform
provides acpi_fill_csrt() function, it will be used to populate the table.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Andy Shevchenko 2019-07-14 19:23:57 +03:00 committed by Bin Meng
parent eef3007945
commit ddd2a4244c
2 changed files with 33 additions and 0 deletions
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1
arch/x86/include/asm/acpi_table.h
View file

@ -401,6 +401,7 @@ u32 acpi_fill_madt(u32 current);
int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
u16 seg_nr, u8 start, u8 end);
u32 acpi_fill_mcfg(u32 current);
u32 acpi_fill_csrt(u32 current);
void acpi_create_gnvs(struct acpi_global_nvs *gnvs);
ulong write_acpi_tables(ulong start);

32
arch/x86/lib/acpi_table.c
View file

@ -337,6 +337,30 @@ static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
header->checksum = table_compute_checksum((void *)mcfg, header->length);
}
__weak u32 acpi_fill_csrt(u32 current)
{
return current;
}
static void acpi_create_csrt(struct acpi_csrt *csrt)
{
struct acpi_table_header *header = &(csrt->header);
u32 current = (u32)csrt + sizeof(struct acpi_csrt);
memset((void *)csrt, 0, sizeof(struct acpi_csrt));
/* Fill out header fields */
acpi_fill_header(header, "CSRT");
header->length = sizeof(struct acpi_csrt);
header->revision = 0;
current = acpi_fill_csrt(current);
/* (Re)calculate length and checksum */
header->length = current - (u32)csrt;
header->checksum = table_compute_checksum((void *)csrt, header->length);
}
static void acpi_create_spcr(struct acpi_spcr *spcr)
{
struct acpi_table_header *header = &(spcr->header);
@ -464,6 +488,7 @@ ulong write_acpi_tables(ulong start)
struct acpi_fadt *fadt;
struct acpi_mcfg *mcfg;
struct acpi_madt *madt;
struct acpi_csrt *csrt;
struct acpi_spcr *spcr;
int i;
@ -553,6 +578,13 @@ ulong write_acpi_tables(ulong start)
acpi_add_table(rsdp, mcfg);
current = ALIGN(current, 16);
debug("ACPI: * CSRT\n");
csrt = (struct acpi_csrt *)current;
acpi_create_csrt(csrt);
current += csrt->header.length;
acpi_add_table(rsdp, csrt);
current = ALIGN(current, 16);
debug("ACPI: * SPCR\n");
spcr = (struct acpi_spcr *)current;
acpi_create_spcr(spcr);