From e8c6577617bffa4402c07c7aa20e3c24f03c1c20 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 6 Sep 2020 00:48:07 -0400
Subject: program loading, others

big kernel additions: paging, elf loading, separate kernel and user page allocation
it now properly loads and runs sd0:bin/init.elf
still need to determine which disk was booted from, and start the init on that disk
---
 src/kernel/ide.c | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

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

diff --git a/src/kernel/ide.c b/src/kernel/ide.c
index a4ba34c..70b1dee 100644
--- a/src/kernel/ide.c
+++ b/src/kernel/ide.c
@@ -15,7 +15,7 @@ struct ide_drive_info {
 };
 
 static struct ide_drive_info ide_drives[MAX_IDE_DRIVES];
-static drive_id_t n_ide_drives = 0;
+static drive_id_t n_ide_drives;
 
 typedef uint16_t spinner_t;
 
@@ -53,7 +53,7 @@ static uint8_t wait_for_data_ready_not_busy(uint16_t base_port) {
   panic("Spun out in IDE driver.");
 }
 
-static uint8_t ide_ata_rs(const struct drive *d, uint32_t start, uint32_t count, void *buffer) {
+static uint32_t ide_ata_rs(const struct drive *d, uint32_t start, uint32_t count, void *buffer) {
   if (start >= d->n_sectors)
     return 0;
   if (start + count > d->n_sectors)
@@ -91,21 +91,29 @@ static uint8_t ide_ata_rs(const struct drive *d, uint32_t start, uint32_t count,
   return count;
 }
 
-static uint8_t ide_ata_ws(const struct drive *d, uint32_t start, uint32_t count, const void *buffer) {
+static uint32_t ide_ata_ws(const struct drive *d, uint32_t start, uint32_t count, const void *buffer) {
   panic("IDE ATA writing not implemented yet");
   return 0;
 }
 
-static uint8_t ide_atapi_rs(const struct drive *d, uint32_t start, uint32_t count, void *buffer) {
-  //panic("IDE ATAPI reading not implemented yet");
-  return 0;
+static uint32_t ide_atapi_rs(const struct drive *d, uint32_t start, uint32_t count, void *buffer) {
+  if (start >= d->n_sectors)
+    return 0;
+  if (start + count > d->n_sectors)
+    count = d->n_sectors - start;
+  if (!count)
+    return 0;
+
+  
 }
 
-static uint8_t ide_atapi_ws(const struct drive *d, uint32_t start, uint32_t count, const void *buffer) {
+static uint32_t ide_atapi_ws(const struct drive *d, uint32_t start, uint32_t count, const void *buffer) {
   panic("IDE ATAPI writing not implemented yet");
   return 0;
 }
 
+static void nop(const struct drive *d) { }
+
 struct id_space {
   uint8_t skip1[120];
   uint32_t max_lba;//120
@@ -132,9 +140,13 @@ static void test_drive(uint16_t base_port, uint16_t alt_port, bool slave) {
 
   outb(base_port | ATA_REG_CMD, ATA_CMD_ID);
 
-  if (!inb(base_port | ATA_REG_STATUS))
+  uint8_t status = inb(base_port | ATA_REG_STATUS);
+  if (!status || (status == 0x7f))
     return;
 
+  next_d.ready = &nop;
+  next_d.done = &nop;
+
   struct id_space ids;
 
   if (!(wait_for_error_or_ready(base_port) & ATA_STATUS_ERROR)) {
@@ -157,7 +169,7 @@ static void test_drive(uint16_t base_port, uint16_t alt_port, bool slave) {
       next_d.write_sectors = &ide_atapi_ws;
 
       //TODO: issue proper identify command
-      ids.max_lba = -1;
+      return;
     }
     else if (code == 0xc33c) {
       next_d.drive_type = "IDE SATA";
@@ -177,6 +189,8 @@ static void test_drive(uint16_t base_port, uint16_t alt_port, bool slave) {
 }
 
 void init_ide() {
+  n_ide_drives = 0;
+
   uint16_t check_from = 0;
   struct pci_device *device;
   //double parentheses to let gcc know this assignment isn't a mistake
-- 
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