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acpi: cannot have RSDT above 4 GiB

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The field RsdtAddress has only 32 bit. The RSDT table cannot be located
beyond 4 GiB.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt 2023-11-13 00:53:56 +01:00 committed by Tom Rini
parent dbdc9c6aef
commit c7b31a9ad5
1 changed files with 16 additions and 7 deletions
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23
lib/acpi/base.c
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@ -12,6 +12,7 @@
#include <dm/acpi.h>
#include <mapmem.h>
#include <tables_csum.h>
#include <linux/sizes.h>
void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
struct acpi_xsdt *xsdt)
@ -21,10 +22,13 @@ void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->rsdt_address = map_to_sysmem(rsdt);
if (rsdt)
rsdp->rsdt_address = map_to_sysmem(rsdt);
rsdp->xsdt_address = map_to_sysmem(xsdt);
if (xsdt)
rsdp->xsdt_address = map_to_sysmem(xsdt);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
/* Calculate checksums */
@ -68,11 +72,15 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
static int acpi_write_base(struct acpi_ctx *ctx,
const struct acpi_writer *entry)
{
/* We need at least an RSDP and an RSDT Table */
/* We need at least an RSDP and an XSDT Table */
ctx->rsdp = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
ctx->rsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
if (map_to_sysmem(ctx->current) < SZ_4G - SZ_64K) {
ctx->rsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
} else {
ctx->rsdt = 0;
}
ctx->xsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
@ -80,7 +88,8 @@ static int acpi_write_base(struct acpi_ctx *ctx,
memset(ctx->base, '\0', ctx->current - ctx->base);
acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
acpi_write_rsdt(ctx->rsdt);
if (ctx->rsdt)
acpi_write_rsdt(ctx->rsdt);
acpi_write_xsdt(ctx->xsdt);
return 0;