kern: acpi: Add ACPI table definitions

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/sys/include/acpi/tables.h b/src/sys/include/acpi/tables.h
new file mode 100644
index 0000000..bebca87
--- /dev/null
+++ b/src/sys/include/acpi/tables.h
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _ACPI_TABLES_H_
+#define _ACPI_TABLES_H_ 1
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+
+/* MADT APIC header types */
+#define APIC_TYPE_LOCAL_APIC            0
+#define APIC_TYPE_IO_APIC               1
+#define APIC_TYPE_INTERRUPT_OVERRIDE    2
+
+#define OEMID_SIZE 6
+
+struct __packed acpi_header {
+    char signature[4];          /* ASCII signature string */
+    uint32_t length;            /* Length of table in bytes */
+    uint8_t revision;           /* Revision of the structure */
+    uint8_t checksum;           /* Checksum of the header */
+    char oemid[OEMID_SIZE];     /* OEM-supplied string that IDs the OEM */
+    char oem_table_id[8];       /* OEM-supplied string (used by OEM) */
+    uint32_t oem_revision;      /* OEM-supplied revision number */
+    uint32_t creator_id;        /* Vendor ID of creator utility */
+    uint32_t creator_revision;  /* Revision of creator utility */
+};
+
+struct __packed acpi_rsdp {
+    uint64_t signature;         /* RSD PTR */
+    uint8_t checksum;           /* Structure checksum */
+    char oemid[OEMID_SIZE];     /* OEM-supplied string that IDs the OEM */
+    uint8_t revision;           /* Revision of the structure */
+    uint32_t rsdt_addr;         /* RSDT physical address */
+
+    /* Reserved if revision < 2 */
+    uint32_t length;            /* Length of table in bytes */
+    uint64_t xsdt_addr;         /* XSDT physical address */
+    uint8_t ext_checksum;       /* Extended checksum */
+    uint8_t reserved[3];
+};
+
+/*
+ * XSDT or RSDT depending
+ * on what revision the header
+ * says.
+ */
+struct __packed acpi_root_sdt {
+    struct acpi_header hdr;
+    uint32_t tables[];
+};
+
+struct __packed acpi_madt {
+    struct acpi_header hdr;
+    uint32_t lapic_addr;
+    uint32_t flags;
+};
+
+struct __packed apic_header {
+    uint8_t type;
+    uint8_t length;
+};
+
+struct __packed local_apic {
+    struct apic_header hdr;
+    uint8_t processor_id;
+    uint8_t apic_id;
+    uint32_t flags;
+};
+
+struct __packed ioapic {
+    struct apic_header hdr;
+    uint8_t ioapic_id;
+    uint8_t reserved;
+    uint32_t ioapic_addr;
+    uint32_t gsi_base;
+};
+
+struct __packed interrupt_override {
+    struct apic_header hdr;
+    uint8_t bus;
+    uint8_t source;         /* IRQ */
+    uint32_t interrupt;     /* GSI */
+    uint16_t flags;
+};
+
+struct __packed acpi_gas {
+    uint8_t address_space_id;
+    uint8_t register_bit_width;
+    uint8_t register_bit_offset;
+    uint8_t reserved;
+    uint64_t address;
+};
+
+/*
+ * ACPI Address Space ID definitions for GAS
+ *
+ * See section 5.2.3.2 of the ACPI software programming
+ * manual.
+ *
+ * XXX: 0x0B->0x7E is reserved as well as 0x80->0xBF
+ *      and 0xC0->0xFF is OEM defined. Values other than
+ *      the ones specified below are either garbage or
+ *      OEM specific values.
+ */
+#define ACPI_GAS_SYSMEM   0x00      /* System memory space */
+#define ACPI_GAS_SYSIO    0x01      /* System I/O space */
+#define ACPI_GAS_PCICONF  0x02      /* PCI configuration space */
+#define ACPI_GAS_EC       0x03      /* Embedded controller */
+#define ACPI_GAS_SMBUS    0x04      /* System management bus */
+#define ACPI_GAS_CMOS     0x05      /* System CMOS */
+#define ACPI_GAS_PCIBAR   0x06      /* PCI BAR target */
+#define ACPI_GAS_IPMI     0x07      /* IPMI (sensor monitoring) */
+#define ACPI_GAS_GPIO     0x08      /* General Purpose I/O */
+#define ACPI_GAS_GSBUS    0x09      /* GenericSerialBus */
+#define ACPI_GAS_PLATCOM  0x0A      /* Platform Communications Channel */
+
+/*
+ * ACPI address size definitions for GAS
+ *
+ * See section 5.2.3.2 of the ACPI software programming
+ * manual.
+ *
+ * This is really retarded Intel and Microsoft, thank you.
+ */
+#define ACPI_GAS_UNDEF  0   /* Undefined (legacy reasons) */
+#define ACPI_GAS_BYTE   1   /* Byte access */
+#define ACPI_GAS_WORD   2   /* Word access */
+#define ACPI_GAS_DWORD  3   /* Dword access */
+#define ACPI_GAS_QWORD  4   /* Qword access */
+
+#endif  /* _ACPI_TABLES_H_ */