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| author | Duncan Laurie <dlaurie@chromium.org> | 2016-05-09 11:08:46 -0700 |
|---|---|---|
| committer | Duncan Laurie <dlaurie@google.com> | 2016-05-21 05:59:01 +0200 |
| commit | 3829f238fa6eca7676ea3122da94a1ba239c5153 (patch) | |
| tree | dc1b93a7ad8cfdf6acad45dbbc359c5422bd7e02 /src/arch | |
| parent | b9552841bf9d1f59e173d9eb082b6e31423e8496 (diff) | |
| download | coreboot-3829f238fa6eca7676ea3122da94a1ba239c5153.tar.xz | |
acpigen: Add function to generate ToUUID() from a string
acpigen_write_uuid() will generate a ToUUID() 128-bit buffer object for a
common universally unique identifier that is passed as a string. The
resulting buffer is the UUID in byte format with a specific order of the
bytes as described in the ACPI specification:
ToUUID (uuid)
Compiles to:
Buffer (16) { uuid[3], uuid[2], uuid[1], uuid[0], uuid[5], uuid[4],
uuid[7], uuid[6], uuid[8], uuid[9], uuid[10], uuid[11],
uuid[12], uuid[13], uuid[14], uuid[15] }
Change-Id: Ibbeff926883532dd78477aaa2d26ffffb6ef30c0
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/14838
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/acpigen.c | 36 | ||||
| -rw-r--r-- | src/arch/x86/include/arch/acpigen.h | 1 |
2 files changed, 37 insertions, 0 deletions
diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c index 226fba153c..c370321835 100644 --- a/src/arch/x86/acpigen.c +++ b/src/arch/x86/acpigen.c @@ -24,6 +24,7 @@ #define ACPIGEN_MAXLEN 0xfffff +#include <lib.h> #include <string.h> #include <arch/acpigen.h> #include <console/console.h> @@ -827,3 +828,38 @@ void acpigen_emit_eisaid(const char *eisaid) acpigen_emit_byte((compact >> 8) & 0xff); acpigen_emit_byte(compact & 0xff); } + +/* + * ToUUID(uuid) + * + * ACPI 6.1 Section 19.6.136 table 19-385 defines a special output + * order for the bytes that make up a UUID Buffer object. + * UUID byte order for input: + * aabbccdd-eeff-gghh-iijj-kkllmmnnoopp + * UUID byte order for output: + * ddccbbaa-ffee-hhgg-iijj-kkllmmnnoopp + */ +#define UUID_LEN 16 +void acpigen_write_uuid(const char *uuid) +{ + uint8_t buf[UUID_LEN]; + size_t i, order[UUID_LEN] = { 3, 2, 1, 0, 5, 4, 7, 6, + 8, 9, 10, 11, 12, 13, 14, 15 }; + + /* Parse UUID string into bytes */ + if (hexstrtobin(uuid, buf, UUID_LEN) < UUID_LEN) + return; + + /* BufferOp */ + acpigen_emit_byte(0x11); + acpigen_write_len_f(); + + /* Buffer length in bytes */ + acpigen_write_word(UUID_LEN); + + /* Output UUID in expected order */ + for (i = 0; i < UUID_LEN; i++) + acpigen_emit_byte(buf[order[i]]); + + acpigen_pop_len(); +} diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h index e968778e5c..9e6ef2958f 100644 --- a/src/arch/x86/include/arch/acpigen.h +++ b/src/arch/x86/include/arch/acpigen.h @@ -92,6 +92,7 @@ void acpigen_write_resourcetemplate_footer(void); void acpigen_write_mainboard_resource_template(void); void acpigen_write_mainboard_resources(const char *scope, const char *name); void acpigen_write_irq(u16 mask); +void acpigen_write_uuid(const char *uuid); int get_cst_entries(acpi_cstate_t **); |