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[acpi] Add acpi_ioremap() to map an ACPI-described address

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An ACPI Generic Address Structure (GAS) may be used to describe the
location of a peripheral such as an early boot console.  Add the
relevant definitions and provide acpi_ioremap() as a helper function
to map a region described using this structure.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-11-05 14:07:27 +00:00
parent 08d4d7fe9d
commit 8fd5e27727
2 changed files with 43 additions and 6 deletions
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19
src/core/acpi.c
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@@ -27,6 +27,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <errno.h> #include <errno.h>
#include <byteswap.h> #include <byteswap.h>
#include <ipxe/uaccess.h> #include <ipxe/uaccess.h>
#include <ipxe/iomap.h>
#include <ipxe/acpi.h> #include <ipxe/acpi.h>
#include <ipxe/interface.h> #include <ipxe/interface.h>
@@ -258,6 +259,24 @@ int acpi_extract ( uint32_t signature, void *data,
return -ENOENT; return -ENOENT;
} }
/**
* Map an ACPI generic address
*
* @v address Generic address
* @v len Length of region
* @ret io_addr I/O address, or NULL on error
*/
void * acpi_ioremap ( struct acpi_address *address, size_t len ) {
physaddr_t base = le64_to_cpu ( address->address );
switch ( address->type ) {
case ACPI_ADDRESS_TYPE_MEM:
return ioremap ( base, len );
default:
return NULL;
}
}
/****************************************************************************** /******************************************************************************
* *
* Descriptors * Descriptors

30
src/include/ipxe/acpi.h
View File

@@ -18,6 +18,29 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/api.h> #include <ipxe/api.h>
#include <config/general.h> #include <config/general.h>
/** An ACPI generic address structure */
struct acpi_address {
/** Address space type */
uint8_t type;
/** Register bit width */
uint8_t width;
/** Register bit offset */
uint8_t offset;
/** Access size */
uint8_t access;
/** Address */
uint64_t address;
} __attribute__ (( packed ));
/** A memory address space type */
#define ACPI_ADDRESS_TYPE_MEM 0x00
/** An I/O address space type */
#define ACPI_ADDRESS_TYPE_IO 0x01
/** A bus number address space type */
#define ACPI_ADDRESS_TYPE_BUS 0x02
/** An ACPI small resource descriptor header */ /** An ACPI small resource descriptor header */
struct acpi_small_resource { struct acpi_small_resource {
/** Tag byte */ /** Tag byte */
@@ -74,12 +97,6 @@ struct acpi_qword_address_space_resource {
uint64_t len; uint64_t len;
} __attribute__ (( packed )); } __attribute__ (( packed ));
/** A memory address space type */
#define ACPI_ADDRESS_TYPE_MEM 0x00
/** A bus number address space type */
#define ACPI_ADDRESS_TYPE_BUS 0x02
/** An ACPI resource descriptor */ /** An ACPI resource descriptor */
union acpi_resource { union acpi_resource {
/** Tag byte */ /** Tag byte */
@@ -397,6 +414,7 @@ extern int acpi_extract ( uint32_t signature, void *data,
int ( * extract ) ( const struct acpi_header *zsdt, int ( * extract ) ( const struct acpi_header *zsdt,
size_t len, size_t offset, size_t len, size_t offset,
void *data ) ); void *data ) );
extern void * acpi_ioremap ( struct acpi_address *address, size_t len );
extern void acpi_add ( struct acpi_descriptor *desc ); extern void acpi_add ( struct acpi_descriptor *desc );
extern void acpi_del ( struct acpi_descriptor *desc ); extern void acpi_del ( struct acpi_descriptor *desc );
extern int acpi_install ( int ( * install ) ( struct acpi_header *acpi ) ); extern int acpi_install ( int ( * install ) ( struct acpi_header *acpi ) );