From 4947a84591191564447eda0455162f6ccfdca7dd Mon Sep 17 00:00:00 2001
From: mintsuki <mintsuki@protonmail.com>
Date: Mon, 1 Jun 2020 04:47:55 +0200
Subject: [PATCH] Make sure to mask and flush IRQs for stivale protocol

---
 STIVALE.md           |   4 +++
 qloader2.bin         | Bin 32768 -> 32768 bytes
 src/lib/real.c       |  82 +++++++++++++++++++++++++++++++++++++++++++
 src/lib/real.h       |   2 ++
 src/protos/stivale.c |   3 ++
 5 files changed, 91 insertions(+)

diff --git a/STIVALE.md b/STIVALE.md
index fd501657..54448c59 100644
--- a/STIVALE.md
+++ b/STIVALE.md
@@ -67,6 +67,8 @@ If stivale header flag bit 1 is set, then, if available, 5-level paging is enabl
 
 The A20 gate is enabled.
 
+PIC/APIC IRQs are all masked.
+
 `rsp` is set to the requested stack as per stivale header.
 
 `rdi` will point to the stivale structure (described below).
@@ -91,6 +93,8 @@ PE is enabled (`cr0`).
 
 The A20 gate is enabled.
 
+PIC/APIC IRQs are all masked.
+
 `esp` is set to the requested stack as per stivale header.
 
 A pointer to the stivale structure (described below) is pushed onto this stack
diff --git a/qloader2.bin b/qloader2.bin
index 4c7ebf33fc884b741297fea33a622dac92f1b77b..c76758797b3e52e3ff7a6fa90d98ad62cee97b3f 100644
GIT binary patch
delta 5433
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diff --git a/src/lib/real.c b/src/lib/real.c
index b1d57389..9000d05a 100644
--- a/src/lib/real.c
+++ b/src/lib/real.c
@@ -1,6 +1,88 @@
 #include <stdint.h>
 #include <lib/real.h>
 
+__attribute__((naked))
+void rm_flush_irqs(void) {
+    asm (
+        // Mask PICs
+        "mov al, 0xff\n\t"
+        "out 0x21, al\n\t"
+        "out 0xa1, al\n\t"
+
+        // Save GDT in case BIOS overwrites it
+        "sgdt [8f]\n\t"
+
+        // Save non-scratch GPRs
+        "push ebx\n\t"
+        "push esi\n\t"
+        "push edi\n\t"
+        "push ebp\n\t"
+
+        // Jump to real mode
+        "jmp 0x08:1f\n\t"
+        "1: .code16\n\t"
+        "mov ax, 0x10\n\t"
+        "mov ds, ax\n\t"
+        "mov es, ax\n\t"
+        "mov fs, ax\n\t"
+        "mov gs, ax\n\t"
+        "mov ss, ax\n\t"
+        "mov eax, cr0\n\t"
+        "and al, 0xfe\n\t"
+        "mov cr0, eax\n\t"
+        "jmp 0:2f\n\t"
+        "2:\n\t"
+        "mov ax, 0\n\t"
+        "mov ds, ax\n\t"
+        "mov es, ax\n\t"
+        "mov fs, ax\n\t"
+        "mov gs, ax\n\t"
+        "mov ss, ax\n\t"
+
+        "sti\n\t"
+        "call 2f\n\t"   // call await
+        "cli\n\t"
+
+        // Restore GDT
+        "lgdt [8f]\n\t"
+
+        // Jump back to pmode
+        "mov eax, cr0\n\t"
+        "or al, 1\n\t"
+        "mov cr0, eax\n\t"
+        "jmp 0x18:4f\n\t"
+        "4: .code32\n\t"
+        "mov ax, 0x20\n\t"
+        "mov ds, ax\n\t"
+        "mov es, ax\n\t"
+        "mov fs, ax\n\t"
+        "mov gs, ax\n\t"
+        "mov ss, ax\n\t"
+
+        // Restore non-scratch GPRs
+        "pop ebp\n\t"
+        "pop edi\n\t"
+        "pop esi\n\t"
+        "pop ebx\n\t"
+
+        // Exit
+        "ret\n\t"
+
+        // gdt
+        "1: .long 0\n\t"
+        "   .long 0\n\t"
+
+        // Await
+        ".code16\n\t"
+        "2: xor al, al\n\t"
+        "mov cx, 0x1000\n\t"
+        "3: out 0x80, al\n\t"
+        "loop 3b\n\t"
+        "ret\n\t"
+        ".code32\n\t"
+    );
+}
+
 __attribute__((naked))
 void rm_int(uint8_t int_no, struct rm_regs *out_regs, struct rm_regs *in_regs) {
     asm (
diff --git a/src/lib/real.h b/src/lib/real.h
index 545cbded..b04eb146 100644
--- a/src/lib/real.h
+++ b/src/lib/real.h
@@ -24,4 +24,6 @@ struct rm_regs {
 
 void rm_int(uint8_t int_no, struct rm_regs *out_regs, struct rm_regs *in_regs);
 
+void rm_flush_irqs(void);
+
 #endif
diff --git a/src/protos/stivale.c b/src/protos/stivale.c
index 0b641175..59a0c4e2 100644
--- a/src/protos/stivale.c
+++ b/src/protos/stivale.c
@@ -10,6 +10,7 @@
 #include <lib/time.h>
 #include <lib/print.h>
 #include <lib/random.h>
+#include <lib/real.h>
 #include <drivers/vbe.h>
 #include <drivers/vga_textmode.h>
 #include <fs/file.h>
@@ -226,6 +227,8 @@ void stivale_load(char *cmdline, int boot_drive) {
         deinit_vga_textmode();
     }
 
+    rm_flush_irqs();
+
     if (bits == 64) {
         void *pagemap_ptr;
         if (level5pg && (stivale_hdr.flags & (1 << 1))) {