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-rw-r--r--sys/firmware/acpi/acpi_init.c114
-rw-r--r--sys/include/firmware/acpi/acpi.h39
-rw-r--r--sys/include/firmware/acpi/tables.h76
-rw-r--r--sys/kern/init_main.c3
4 files changed, 232 insertions, 0 deletions
diff --git a/sys/firmware/acpi/acpi_init.c b/sys/firmware/acpi/acpi_init.c
new file mode 100644
index 0000000..fd23ada
--- /dev/null
+++ b/sys/firmware/acpi/acpi_init.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS 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 VegaOS 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.
+ */
+
+/* $Id$ */
+
+#include <firmware/acpi/acpi.h>
+#include <firmware/acpi/tables.h>
+#include <sys/limine.h>
+#include <sys/syslog.h>
+#include <sys/cdefs.h>
+#include <sys/panic.h>
+#include <sys/syslog.h>
+#include <vm/vm.h>
+
+__MODULE_NAME("acpi");
+__KERNEL_META("$Vega$: acpi_init.c, Ian Macro Moffett, "
+ "ACPI init logic");
+
+static volatile struct limine_rsdp_request rsdp_req = {
+ .id = LIMINE_RSDP_REQUEST,
+ .revision = 0
+};
+
+static size_t root_sdt_entries = 0;
+static bool using_xsdt = false;
+static struct acpi_root_sdt *root_sdt = NULL;
+
+/*
+ * Writes out OEMID of ACPI header.
+ *
+ * @type: Type of structure (e.g RSDP)
+ * @hdr: Header of structure.
+ */
+static void
+acpi_print_oemid(const char *type, char oemid[OEMID_SIZE])
+{
+ if (type != NULL) {
+ KINFO("%s OEMID: ", type);
+ }
+
+ for (size_t i = 0; i < OEMID_SIZE; ++i) {
+ kprintf("%c", oemid[i]);
+ }
+ kprintf("\n");
+}
+
+static bool
+acpi_is_checksum_valid(struct acpi_header *hdr)
+{
+ uint8_t sum;
+
+ sum = 0;
+ for (int i = 0; i < hdr->length; ++i) {
+ sum += ((char *)hdr)[i];
+ }
+
+ /* Sum of table (from header to end) must be zero!! */
+ return sum == 0;
+}
+
+void
+acpi_init(void)
+{
+ struct acpi_rsdp *rsdp;
+
+ /* Can't do anything if we have no response! */
+ if (rsdp_req.response == NULL) {
+ panic("RSDP request has no response affiliated...\n");
+ }
+
+ /* Fetch the RSDP */
+ rsdp = rsdp_req.response->address;
+ acpi_print_oemid("RSDP", rsdp->oemid);
+
+ /* Fetch the RSDT/XSDT */
+ if (rsdp->revision >= 2) {
+ using_xsdt = true;
+ root_sdt = PHYS_TO_VIRT(rsdp->xsdt_addr);
+ KINFO("Using XSDT as root SDT\n");
+ } else {
+ root_sdt = PHYS_TO_VIRT(rsdp->rsdt_addr);
+ KINFO("Using RSDT as root SDT\n");
+ }
+ if (!acpi_is_checksum_valid(&root_sdt->hdr)) {
+ panic("Root SDT has an invalid checksum!\n");
+ }
+ root_sdt_entries = (root_sdt->hdr.length - sizeof(root_sdt->hdr)) / 4;
+}
diff --git a/sys/include/firmware/acpi/acpi.h b/sys/include/firmware/acpi/acpi.h
new file mode 100644
index 0000000..65e39a4
--- /dev/null
+++ b/sys/include/firmware/acpi/acpi.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS 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 VegaOS 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.
+ */
+
+/* $Id$ */
+
+#ifndef _ACPI_ACPI_H_
+#define _ACPI_ACPI_H_
+
+#include <sys/types.h>
+
+void acpi_init(void);
+
+#endif /* !_ACPI_ACPI_H_ */
diff --git a/sys/include/firmware/acpi/tables.h b/sys/include/firmware/acpi/tables.h
new file mode 100644
index 0000000..a504bef
--- /dev/null
+++ b/sys/include/firmware/acpi/tables.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS 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 VegaOS 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.
+ */
+
+/* $Id$ */
+
+#ifndef _ACPI_TABLES_H_
+#define _ACPI_TABLES_H_
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+
+#define OEMID_SIZE 6
+
+struct __packed acpi_header {
+ uint32_t signature; /* 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;
+ void *entries; /* 8*n */
+};
+
+#endif /* !_ACPI_TABLES_H_ */
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 6fbc48c..b3a1e8b 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -33,6 +33,7 @@
#include <sys/tty.h>
#include <sys/syslog.h>
#include <sys/machdep.h>
+#include <firmware/acpi/acpi.h>
#include <vm/vm_physseg.h>
#include <logo.h>
@@ -56,6 +57,8 @@ main(void)
processor_init(&bsp);
vm_physseg_init();
+ acpi_init();
+
/* We're done here, halt the processor */
__ASMV("cli; hlt");
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 19:25:16 +0000