From 9b21a40bf2649a03b773d20f6e1dc9fd38432e15 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 17 May 2025 21:53:00 -0400
Subject: kernel: acpi: Add acpi_rsdp()

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/dev/acpi/acpi_init.c    | 8 ++++++++
 sys/include/dev/acpi/acpi.h | 4 ++++
 2 files changed, 12 insertions(+)

(limited to 'sys')

diff --git a/sys/dev/acpi/acpi_init.c b/sys/dev/acpi/acpi_init.c
index ecfb129..67eed29 100644
--- a/sys/dev/acpi/acpi_init.c
+++ b/sys/dev/acpi/acpi_init.c
@@ -46,6 +46,7 @@
 static char oemid[OEMID_SIZE];
 static struct acpi_root_sdt *root_sdt = NULL;
 static size_t root_sdt_entries = 0;
+static paddr_t rsdp_pa = 0;
 static volatile struct limine_rsdp_request rsdp_req = {
     .id = LIMINE_RSDP_REQUEST,
     .revision = 0
@@ -99,6 +100,12 @@ acpi_oemid(void)
     return oemid;
 }
 
+paddr_t
+acpi_rsdp(void)
+{
+    return rsdp_pa;
+}
+
 void
 acpi_init(void)
 {
@@ -112,6 +119,7 @@ acpi_init(void)
     rsdp = rsdp_req.response->address;
     acpi_print_oemid("RSDP", rsdp->oemid);
     memcpy(oemid, rsdp->oemid, OEMID_SIZE);
+    rsdp_pa = VIRT_TO_PHYS(rsdp);
 
     /* Fetch the root SDT */
     if (rsdp->revision >= 2) {
diff --git a/sys/include/dev/acpi/acpi.h b/sys/include/dev/acpi/acpi.h
index 9cd6b87..48eeee4 100644
--- a/sys/include/dev/acpi/acpi.h
+++ b/sys/include/dev/acpi/acpi.h
@@ -30,8 +30,12 @@
 #ifndef _ACPI_H_
 #define _ACPI_H_
 
+#include <sys/types.h>
+
 const char *acpi_oemid(void);
 void *acpi_query(const char *query);
+
+paddr_t acpi_rsdp(void);
 void acpi_init(void);
 
 #endif  /* !_ACPI_H_ */
-- 
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