/* * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. * 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 Hyra 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. */ #include #include #include #include #include #include #include #include #if defined(__x86_64__) #include #endif /* __x86_64__ */ #define pr_trace(fmt, ...) kprintf("acpi: " fmt, ##__VA_ARGS__) static struct acpi_root_sdt *root_sdt = NULL; static size_t root_sdt_entries = 0; static volatile struct limine_rsdp_request rsdp_req = { .id = LIMINE_RSDP_REQUEST, .revision = 0 }; static void acpi_init_hpet(void) { #if defined(__x86_64__) if (hpet_init() != 0) { panic("Could not init HPET\n"); } #endif } /* * Writes out OEMID of ACPI header. * * @type: Type of structure (e.g RSDP) * @oemid: OEMID of structure. */ static void acpi_print_oemid(const char *type, char oemid[OEMID_SIZE]) { if (type != NULL) { pr_trace("%s OEMID: ", type); } for (size_t i = 0; i < OEMID_SIZE; ++i) { kprintf(OMIT_TIMESTAMP "%c", oemid[i]); } kprintf(OMIT_TIMESTAMP "\n"); } struct acpi_root_sdt * acpi_get_root_sdt(void) { return root_sdt; } size_t acpi_get_root_sdt_len(void) { return root_sdt_entries; } void acpi_init(void) { struct acpi_rsdp *rsdp; if (rsdp_req.response == NULL) { panic("RSDP request has no response\n"); } /* Fetch the RSDP */ rsdp = rsdp_req.response->address; acpi_print_oemid("RSDP", rsdp->oemid); /* Fetch the root SDT */ if (rsdp->revision >= 2) { root_sdt = PHYS_TO_VIRT(rsdp->xsdt_addr); pr_trace("Using XSDT as root SDT\n"); } else { root_sdt = PHYS_TO_VIRT(rsdp->rsdt_addr); pr_trace("Using RSDT as root SDT\n"); } if (acpi_checksum(&root_sdt->hdr) != 0) { panic("Root SDT checksum is invalid!\n"); } root_sdt_entries = (root_sdt->hdr.length - sizeof(root_sdt->hdr)) / 4; acpi_init_hpet(); }