Naresh Solanki (naresh.solanki@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17113
-gerrit
commit 5601bc1f10bdb0f3941d132b6e2523b1ffdc777c Author: Naresh G Solanki naresh.solanki@intel.com Date: Tue Oct 25 00:51:24 2016 +0530
arch/x86/acpigen: Add OperationRegion & Field method
Add acpigen_write_opregion that generates ACPI AML code for OperationRegion, region name, region space, region length & region size are inputs.
Add acpigen_write_field that generates ACPI AML code for Field. Operation region name & field list are inputs.
Change-Id: I578834217d39aa3b0d409eb8ba4b5f7a31969fa8 Signed-off-by: Naresh G Solanki naresh.solanki@intel.com --- src/arch/x86/acpigen.c | 119 ++++++++++++++++++++++++++++++++++++ src/arch/x86/include/arch/acpigen.h | 72 ++++++++++++++++++++++ 2 files changed, 191 insertions(+)
diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c index 42d4204..ee51b81 100644 --- a/src/arch/x86/acpigen.c +++ b/src/arch/x86/acpigen.c @@ -351,6 +351,125 @@ void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len) acpigen_emit_byte(pblock_len); }
+/* + * Generate ACPI AML code for OperationRegion + * Arg0: Pointer to struct opregion opreg = OPREGION(rname, space, offset, len) + * where rname is region name, space is region space, offset is region offset & + * len is region length. + * OperationRegion(regionname, regionspace, regionoffset, regionlength) + */ +void acpigen_write_opregion(struct opregion *opreg) +{ + /* OpregionOp */ + acpigen_emit_ext_op(OPREGION_OP); + /* NameString 4 chars only */ + acpigen_emit_simple_namestring(opreg->name); + /* RegionSpace */ + acpigen_emit_byte(opreg->regionspace); + /* RegionOffset & RegionLen, it can be byte word or double word */ + acpigen_write_integer(opreg->regionoffset); + acpigen_write_integer(opreg->regionlen); +} + +static void acpigen_write_field_offset(uint32_t offset, + uint32_t current_bit_pos) +{ + uint32_t diff_bits; + uint8_t i, j; + uint8_t emit[4]; + + if (offset < current_bit_pos) { + printk(BIOS_WARNING, "%s: Cannot move offset backward", + __func__); + return; + } + + diff_bits = offset - current_bit_pos; + /* Upper limit */ + if (diff_bits > 0xFFFFFFF) { + printk(BIOS_WARNING, "%s: Offset very large to encode", + __func__); + return; + } + + if (diff_bits < 0x40) { + emit[0] = diff_bits & 0x3F; + i = 1; + } else { + emit[0] = diff_bits & 0xF; + diff_bits >>= 4; + i = 1; + while (diff_bits) { + emit[i] = diff_bits & 0xFF; + i++; + diff_bits >>= 8; + } + } + /* Update bit 7:6 : Number of bytes followed by emit[0] */ + emit[0] |= (i - 1) << 6; + + acpigen_emit_byte(0); + for (j = 0; j < i; j++) + acpigen_emit_byte(emit[j]); +} + +/* + * Generate ACPI AML code for Field + * Arg0: region name + * Arg1: Pointer to struct fieldlist. + * Arg2: no. of entries in Arg1 + * Arg3: flags which indicate filed access type, lock rule & update rule. + * Example with fieldlist + * struct fieldlist l[] = { + * FIELDLIST_OFFSET(0x84), + * FIELDLIST_NAMESTR("PMCS", 2), + * }; + * acpigen_write_field("UART", l ,ARRAY_SIZE(l), FIELD_ANYACC | FIELD_NOLOCK | + * FIELD_PRESERVE); + * Output: + * Field (UART, AnyAcc, NoLock, Preserve) + * { + * Offset (0x84), + * PMCS, 2 + * } + */ +void acpigen_write_field(const char *name, struct fieldlist *l, size_t count, + uint8_t flags) +{ + uint16_t i; + uint32_t current_bit_pos = 0; + + /* FieldOp */ + acpigen_emit_ext_op(FIELD_OP); + /* Package Length */ + acpigen_write_len_f(); + /* NameString 4 chars only */ + acpigen_emit_simple_namestring(name); + /* Field Flag */ + acpigen_emit_byte(flags); + + for (i = 0; i < count; i++) { + switch (l[i].type) { + case(NAME_STRING): + acpigen_emit_simple_namestring(l[i].name); + acpigen_emit_byte(l[i].bits); + current_bit_pos += l[i].bits; + break; + case(OFFSET): + acpigen_write_field_offset(l[i].bits, current_bit_pos); + current_bit_pos = l[i].bits; + break; + default: + /* If type is invalid then display an error message. */ + if (l[i].type != FIELD_TYPE_MAX) + printk(BIOS_ERR, "%s: Invalid field type 0x%X\n" + , __func__, l[i].type); + break; + } + } + acpigen_pop_len(); +} + void acpigen_write_empty_PCT(void) { /* diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h index 7c15a31..4169fdf 100644 --- a/src/arch/x86/include/arch/acpigen.h +++ b/src/arch/x86/include/arch/acpigen.h @@ -53,6 +53,8 @@ enum { EXT_OP_PREFIX = 0x5B, SLEEP_OP = 0x22, DEBUG_OP = 0x31, + OPREGION_OP = 0x80, + FIELD_OP = 0x81, DEVICE_OP = 0x82, PROCESSOR_OP = 0x83, POWER_RES_OP = 0x84, @@ -84,6 +86,64 @@ enum { ONES_OP = 0xFF, };
+#define FIELDLIST_OFFSET(X) { .type = OFFSET, \ + .name = "",\ + .bits = X * 8, \ + } +#define FIELDLIST_NAMESTR(X, Y) { .type = NAME_STRING, \ + .name = X, \ + .bits = Y, \ + } + +#define FIELD_ANYACC 0 +#define FIELD_BYTEACC 1 +#define FIELD_WORDACC 2 +#define FIELD_DWORDACC 3 +#define FIELD_QWORDACC 4 +#define FIELD_BUFFERACC 5 +#define FIELD_NOLOCK (0<<4) +#define FIELD_LOCK (1<<4) +#define FIELD_PRESERVE (0<<5) +#define FIELD_WRITEASONES (1<<5) +#define FIELD_WRITEASZEROS (2<<5) + +enum field_type { + OFFSET, + NAME_STRING, + FIELD_TYPE_MAX, +}; + +struct fieldlist { + enum field_type type; + const char *name; + u32 bits; +}; + +#define OPREGION(rname, space, offset, len) {.name = rname, \ + .regionspace = space, \ + .regionoffset = offset, \ + .regionlen = len, \ + } + +enum region_space { + SYSTEMMEMORY, + SYSTEMIO, + PCI_CONFIG, + EMBEDDEDCONTROL, + SMBUS, + CMOS, + PCIBARTARGET, + IPMI, + REGION_SPACE_MAX, +}; + +struct opregion { + const char *name; + enum region_space regionspace; + unsigned long regionoffset; + unsigned long regionlen; +}; + void acpigen_write_len_f(void); void acpigen_pop_len(void); void acpigen_set_current(char *curr); @@ -175,6 +235,18 @@ void acpigen_write_return_byte(uint8_t arg); */ void acpigen_write_dsm(const char *uuid, void (*callbacks[])(void *), size_t count, void *arg); +/* + * Generate ACPI AML code for OperationRegion + * This function takes input region name, region space, region offset & region + * length. + */ +void acpigen_write_opregion(struct opregion *opreg); +/* + * Generate ACPI AML code for Field + * This function takes input region name, fieldlist, count & flags. + */ +void acpigen_write_field(const char *name, struct fieldlist *l, size_t count, + uint8_t flags);
int get_cst_entries(acpi_cstate_t **);
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Naresh Solanki