From 7db6db5ae64e7ab2626bbd898c63f58e053dc1a6 Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Sun, 25 Apr 2021 12:41:24 +0200
Subject: Debug multiboot, enable apic and ACPI table parsing

---
 src/drivers/acpi.cc  | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/drivers/acpi.hpp | 43 +++++++++++++++++++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 src/drivers/acpi.cc
 create mode 100644 src/drivers/acpi.hpp

(limited to 'src/drivers')

diff --git a/src/drivers/acpi.cc b/src/drivers/acpi.cc
new file mode 100644
index 0000000..bb48ba4
--- /dev/null
+++ b/src/drivers/acpi.cc
@@ -0,0 +1,64 @@
+#include "acpi.hpp"
+#include "core/paging.hpp"
+#include "drivers/framebuffer.hpp"
+#include "libs/stdio.hpp"
+#include "libs/string.hpp"
+
+// TODO: ALL!
+
+
+char acpi_load_madt(void* rsdp_p){
+    // Load RSDP
+    RSDP rsdp;
+    memcpy(rsdp_p, &rsdp, sizeof(rsdp));
+    if(rsdp.signature!=ACPI_RSDP_SIGNATURE){
+        printk("Invalid RSDP signature\n");
+        return 1;
+    }
+    if(acpi_checksum(rsdp_p, 20)){
+        printk("Wrong RSDP Signature\n\n");
+        return 1;
+    }
+    printk("ACPI Revision %d detected!\n",rsdp.revision);
+
+    // Load RSDT
+    RSDT rsdt;
+
+    paging_allocate_addr(kpml4,(u64)rsdp.rsdt_addr,(u64)rsdp.rsdt_addr,PAGING_OPT_P|PAGING_OPT_RW);
+    memcpy((void*)rsdp.rsdt_addr, &rsdt, sizeof(rsdt));
+    rsdt.first_entry_addr_ptr=rsdp.rsdt_addr+36;
+
+    if(rsdt.header.signature !=ACPI_RSDT_SIGNATURE){
+        printk("Invalid RSDT signature\n");
+        return 1;
+    }
+    if(acpi_checksum((void*)rsdp.rsdt_addr, rsdt.header.length)){
+        printk("Wrong RSDT Signature\n");
+        return 1;
+    }
+
+    // Locate MADT
+    for(int i=0;i<10;i++){
+        u32 *addr=(u32*)(rsdt.first_entry_addr_ptr+i*4);
+        u64 header_p_i=*addr;
+        ACPI_TABLE_HEADER header;
+        paging_allocate_addr(kpml4,header_p_i,header_p_i,PAGING_OPT_P|PAGING_OPT_RW);
+        memcpy((void*)header_p_i, &header, sizeof(header));
+        if(header.signature==ACPI_MADT_SIGNATURE){
+            printk("MADT found!");
+        }
+    }
+
+
+
+    return 0;
+}
+
+char acpi_checksum(void* p, char size){
+    char checksum=0;
+    char* data_p=(char*)p;
+    for(int i=0;i<size;i++){
+        checksum+=data_p[i];
+    }
+    return (checksum!=0);
+}
\ No newline at end of file
diff --git a/src/drivers/acpi.hpp b/src/drivers/acpi.hpp
new file mode 100644
index 0000000..7bbcdb0
--- /dev/null
+++ b/src/drivers/acpi.hpp
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "include/boucane.hpp"
+
+#define ACPI_RSDP_SIGNATURE 0x2052545020445352
+#define ACPI_RSDT_SIGNATURE 0x54445352
+#define ACPI_MADT_SIGNATURE 0x43495041
+
+typedef struct RSDP {
+    u64 signature;
+    u8 checksum;
+    u64 oemid:48;
+    u8 revision;
+    u32 rsdt_addr;
+    u32 length;
+} __attribute__((packed)) RSDP;
+
+typedef struct ACPI_TABLE_HEADER {
+    u32 signature;
+    u32 length;
+    u8 revision;
+    u8 checksum;
+    u64 oemid:48;
+    u64 oem_table_id;
+    u32 oem_revision;
+    u32 creator_id;
+    u32 creator_revision;
+} __attribute__((packed)) ACPI_TABLE_HEADER;
+
+typedef struct RSDT {
+    ACPI_TABLE_HEADER header;
+    u32 first_entry_addr_ptr;
+} __attribute__((packed)) RSDT;
+
+typedef struct INT_CTRL_HEADER {
+    u8 type;
+    u8 length;
+} __attribute__((packed)) INT_CTRL_HEADER;
+
+
+char acpi_load_madt(void* rsdp_p);
+char acpi_checksum(void* p, char size);
+
-- 
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