From d5c82e8a7d02eee326863b946c6c54fbca42daff Mon Sep 17 00:00:00 2001
From: LuigiBlood <luigiblood@gmail.com>
Date: Sat, 29 Jul 2023 22:33:18 +0200
Subject: [PATCH] Decompiled leoRead_system_area()

---
 src/libleo/leocmdex.c  | 90 +++++++++++++++++++++++++++++++++++++++++-
 tools/symbol_addrs.txt |  3 ++
 2 files changed, 91 insertions(+), 2 deletions(-)

diff --git a/src/libleo/leocmdex.c b/src/libleo/leocmdex.c
index 8b74dac..7d7bd42 100644
--- a/src/libleo/leocmdex.c
+++ b/src/libleo/leocmdex.c
@@ -1,5 +1,91 @@
-#include "common.h"
+#include <ultra64.h>
+#include <leo.h>
+#include "libleo/internal.h"
+
+extern u16 LEOrw_flags;
 
 #pragma GLOBAL_ASM("asm/nonmatchings/libleo/leocmdex/leomain.s")
 
-#pragma GLOBAL_ASM("asm/nonmatchings/libleo/leocmdex/leoRead_system_area.s")
+/*const LEOCmdRead leo_sys_read_cmd =
+{
+	{LEO_COMMAND_READ,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00000000},
+	12,1,0,0
+};
+
+const u8 leo_sys_form_lbas[] = {0, 1, 8, 9};*/
+
+extern LEOCmdRead leo_sys_read_cmd;
+extern u8 leo_sys_form_lbas[];
+
+u8 leoRead_system_area(void) {
+    LEOCmdRead temp_cmd;
+    LEOCmd* prev_cmd;
+    u32 retry_cntr;
+    s32 read_mode;
+    
+    prev_cmd = LEOcur_command;
+    LEOcur_command = (LEOCmd*)&temp_cmd;
+    read_mode = 0;
+    retry_cntr = 0;
+
+    while (1) {
+        LEOdisk_type = 0;
+        //For lba_to_phys to avoid dealing with alternative tracks on the disk
+        LEO_sys_data.param.defect_num[0] = 0;
+        LEOrw_flags = 0x3000;
+        temp_cmd = leo_sys_read_cmd;
+        temp_cmd.buff_ptr = &LEO_sys_data;
+        
+        if (read_mode == 0) {
+            //read System LBA 12 (+0, this is an offset value for leoRead_common)
+            //see leo_sys_read_cmd premade struct
+            leoRead_common(0);
+            switch (temp_cmd.header.sense) {
+            case LEO_SENSE_NO_ADDITIONAL_SENSE_INFOMATION:
+                do {
+                    //if expecting a retail disk, LBA 12 is expected to do a read error, if not then freeze
+                } while (LEO_country_code != 0);
+                retry_cntr = 0;
+                read_mode--;
+                continue;
+            case LEO_SENSE_UNRECOVERED_READ_ERROR:
+                do {
+                    //if expecting a development disk, LBA 12 is expected to read correctly, if not then freeze
+                } while (LEO_country_code == 0);
+                retry_cntr = 0;
+                read_mode--;
+                continue;
+            }
+        } else {
+            //read System LBA 0,1,8,9 (or 2,3,10,11 for dev)
+            temp_cmd.lba = leo_sys_form_lbas[retry_cntr & 3];
+            if (LEO_country_code == 0) {
+                temp_cmd.lba += 2;
+            }
+            leoRead_common(0);
+            if (temp_cmd.header.status == LEO_STATUS_GOOD) {
+                do {
+                    //if disk country and set country code in libleo mismatch, then freeze
+                } while (LEO_sys_data.param.country != LEO_country_code);
+                break;
+            }
+        }
+    system_retry:
+        if (leoChk_err_retry(temp_cmd.header.sense) != LEO_SENSE_NO_ADDITIONAL_SENSE_INFOMATION) {
+            break;
+        }
+        if (retry_cntr++ >= 0x40U) {
+            break;
+        }
+        if ((retry_cntr & 7) == 0) {
+            //Recalibrate drive every 8th tries
+            if ((temp_cmd.header.sense = leoSend_asic_cmd_w(ASIC_RECAL, 0)) == LEO_SENSE_NO_ADDITIONAL_SENSE_INFOMATION) {
+                continue;
+            }
+            goto system_retry;
+        }
+    }
+    LEOcur_command = prev_cmd;
+    prev_cmd->header.sense = temp_cmd.header.sense;
+    return prev_cmd->header.sense;
+}
diff --git a/tools/symbol_addrs.txt b/tools/symbol_addrs.txt
index 72e1635..21905f0 100644
--- a/tools/symbol_addrs.txt
+++ b/tools/symbol_addrs.txt
@@ -125,6 +125,9 @@ LEORAM_BYTE = 0x8007DD28;
 LEOVZONE_TBL = 0x8007DB98;
 LEOVZONE_PZONEHD_TBL = 0x8007DC98;
 LEOBYTE_TBL2 = 0x8007DB84;
+leo_sys_read_cmd = 0x80079560;
+leo_sys_form_lbas = 0x8007DA40;
+LEO_sys_data = 0x800FF9F0;
 LEOdrive_flag = 0x801006D4;
 LEOtgt_param = 0x801006E0;
 leoDiskStack = 0x801020D0;