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acpi: Support writing a string

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ACPI supports storing a simple null-terminated string. Add support for
this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-07 13:11:53 -06:00 committed by Bin Meng
parent 83b2bd5a74
commit 3df33bda5c
3 changed files with 44 additions and 0 deletions
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10
include/acpi/acpigen.h
View File

@ -24,6 +24,7 @@ enum {
BYTE_PREFIX = 0x0a, BYTE_PREFIX = 0x0a,
WORD_PREFIX = 0x0b, WORD_PREFIX = 0x0b,
DWORD_PREFIX = 0x0c, DWORD_PREFIX = 0x0c,
STRING_PREFIX = 0x0d,
QWORD_PREFIX = 0x0e, QWORD_PREFIX = 0x0e,
PACKAGE_OP = 0x12, PACKAGE_OP = 0x12,
}; };
@ -155,4 +156,13 @@ char *acpigen_write_package(struct acpi_ctx *ctx, int nr_el);
*/ */
void acpigen_write_integer(struct acpi_ctx *ctx, u64 data); void acpigen_write_integer(struct acpi_ctx *ctx, u64 data);
/**
* acpigen_write_string() - Write a string
*
* This writes a STRING_PREFIX followed by a null-terminated string
*
* @ctx: ACPI context pointer
* @str: String to write
*/
void acpigen_write_string(struct acpi_ctx *ctx, const char *str);
#endif #endif

6
lib/acpi/acpigen.c
View File

@ -147,3 +147,9 @@ void acpigen_emit_string(struct acpi_ctx *ctx, const char *str)
acpigen_emit_stream(ctx, str, str ? strlen(str) : 0); acpigen_emit_stream(ctx, str, str ? strlen(str) : 0);
acpigen_emit_byte(ctx, '\0'); acpigen_emit_byte(ctx, '\0');
} }
void acpigen_write_string(struct acpi_ctx *ctx, const char *str)
{
acpigen_emit_byte(ctx, STRING_PREFIX);
acpigen_emit_string(ctx, str);
}

28
test/dm/acpigen.c
View File

@ -23,6 +23,7 @@
#define ACPI_CONTEXT_SIZE 150 #define ACPI_CONTEXT_SIZE 150
#define TEST_STRING "frogmore" #define TEST_STRING "frogmore"
#define TEST_STRING2 "ranch"
#define TEST_STREAM2 "\xfa\xde" #define TEST_STREAM2 "\xfa\xde"
#define TEST_INT8 0x7d #define TEST_INT8 0x7d
@ -477,3 +478,30 @@ static int dm_test_acpi_integer(struct unit_test_state *uts)
return 0; return 0;
} }
DM_TEST(dm_test_acpi_integer, 0); DM_TEST(dm_test_acpi_integer, 0);
/* Test writing a string */
static int dm_test_acpi_string(struct unit_test_state *uts)
{
struct acpi_ctx *ctx;
u8 *ptr;
ut_assertok(alloc_context(&ctx));
ptr = acpigen_get_current(ctx);
acpigen_write_string(ctx, TEST_STRING);
acpigen_write_string(ctx, TEST_STRING2);
ut_asserteq(2 + sizeof(TEST_STRING) + sizeof(TEST_STRING2),
acpigen_get_current(ctx) - ptr);
ut_asserteq(STRING_PREFIX, ptr[0]);
ut_asserteq_str(TEST_STRING, (char *)ptr + 1);
ptr += 1 + sizeof(TEST_STRING);
ut_asserteq(STRING_PREFIX, ptr[0]);
ut_asserteq_str(TEST_STRING2, (char *)ptr + 1);
free_context(&ctx);
return 0;
}
DM_TEST(dm_test_acpi_string, 0);