From 7a912d1b668ab86ffe088eca3ac7e6f78a04a0c5 Mon Sep 17 00:00:00 2001
From: Tyler Murphy <=>
Date: Mon, 17 Jul 2023 19:34:52 -0400
Subject: refactoring

---
 kernel/src/acpi/acpi.c | 141 -------------------------------------------------
 1 file changed, 141 deletions(-)
 delete mode 100644 kernel/src/acpi/acpi.c

(limited to 'kernel/src/acpi/acpi.c')

diff --git a/kernel/src/acpi/acpi.c b/kernel/src/acpi/acpi.c
deleted file mode 100644
index ef1fb76..0000000
--- a/kernel/src/acpi/acpi.c
+++ /dev/null
@@ -1,141 +0,0 @@
-#include <panic.h>
-#include <string.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <sys.h>
-
-#include "acpi.h"
-#include "boot/tag.h"
-#include "print.h"
-
-static struct RootSystemDescriptionTable *rsdt;
-static struct FixedACPIDescriptionTable *fadt;
-
-static uint16_t SLP_TYPa;
-static uint16_t SLP_TYPb;
-static uint16_t SLP_EN;
-static uint16_t SCI_EN;
-
-static bool is_init = false;
-
-bool checksum(uint8_t *data, size_t len) {
-    unsigned char sum = 0;
-    for (size_t i = 0; i < len; i++)
-        sum += data[i];
-    return sum == 0;
-}
-
-static void *find_fadt(void) {
-    int entries = (rsdt->header.length - sizeof(rsdt->header)) / 4;
- 
-    for (int i = 0; i < entries; i++) {
-        uintptr_t sdt_ptr = rsdt->sdt_table[i];
-        struct SystemDescriptionTableHeader *h = (void*) sdt_ptr;
-        if (!strncmp(h->signature, "FACP", 4))
-            return (void *) h;
-    }
- 
-    return NULL;
-}
-
-static int read_s5_addr(void) {
-    uintptr_t ptr = fadt->dsdt;
-    char *s5_addr = (void*) (ptr + 36);
-    
-    int dsdt_len = *((int*) (ptr+1)) - 36;
-    while (0 < dsdt_len--) {
-       if ( memcmp(s5_addr, "_S5_", 4) == 0)
-          break;
-       s5_addr++;
-    }
-
-    if (dsdt_len > 0) {
-        // check for valid AML structure
-        if ( ( *(s5_addr-1) == 0x08 || ( *(s5_addr-2) == 0x08 && *(s5_addr-1) == '\\') ) && *(s5_addr+4) == 0x12 ) {
-            s5_addr += 5;
-            s5_addr += ((*s5_addr &0xC0)>>6) +2;   // calculate PkgLength size
-
-            if (*s5_addr == 0x0A)
-               s5_addr++;   // skip byteprefix
-            SLP_TYPa = *(s5_addr)<<10;
-            s5_addr++;
-
-            if (*s5_addr == 0x0A)
-               s5_addr++;   // skip byteprefix
-            SLP_TYPb = *(s5_addr)<<10;
-
-            SLP_EN = 1<<13;
-            SCI_EN = 1;
-
-        } else {
-            errork("\\_S5 parse error.");
-            return 1;
-        }
-    } else {
-        errork("\\_S5 not present.");
-        return 1;
-    }
-    return 0;
-}
-
-void acpi_init(void) {
-
-    is_init = false;
-
-    debugk("Loading ACPI");
-
-    struct BootTag *tag;
-    if(!get_boot_tag(ID_RSDP, &tag)) {
-        errork("Could not find RSDP");
-        return;
-    }
-
-    debugk("Loading RSDT");
-
-    struct RootSystemDescriptionPointer *rsdp = tag->data.rsdp;
-    if (!checksum((uint8_t*) rsdp, sizeof(struct RootSystemDescriptionPointer))) {
-        errork("RSDP checksum failed to validate");
-        return;
-    }
-
-    uintptr_t rsdt_ptr = rsdp->rsdt_address;
-    rsdt = (void *) rsdt_ptr;
-    if (!checksum((uint8_t*) &rsdt->header, rsdt->header.length)) {
-        errork("RSDT checksum failed to validate");
-        return;
-    }
-
-    debugk("Loading FADT");
-
-    fadt = find_fadt();
-    if (fadt == NULL) {
-        errork("Could not find FADT");
-        return;
-    }
-
-    if (!checksum((uint8_t*) &fadt->header, fadt->header.length)) {
-        errork("FADT checksum failed to validate");
-        return;
-    }
-
-    debugk("Reading \\_S5 Addr");
-
-    if (read_s5_addr()) {
-        return;
-    }
-
-    outb(fadt->smi_command_port,fadt->acpi_enable);
-
-    succek("ACPI has been loaded");
-    is_init = true;
-}
-
-void acpi_poweroff(void) {
-    if (is_init) {
-        outw((unsigned int) fadt->pm1_a_control_block, SLP_TYPb | SLP_EN);
-        panic("failed to shutdown");
-    } else {
-        errork("Cannot shutdown, ACPI not loaded");
-    }
-}
-- 
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