From: John Tsiombikas <nuclear@member.fsf.org>
Date: Sun, 13 Jun 2021 03:31:47 +0000 (+0300)
Subject: missing "SEG_BIG" flag in data segments (desc_seg())
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=3sys;a=commitdiff_plain;h=3029144412cf13580e11bc1dffca8b14e05014d0

missing "SEG_BIG" flag in data segments (desc_seg())
---

diff --git a/sys1/kern/src/desc.c b/sys1/kern/src/desc.c
index 9af939e..4e02991 100644
--- a/sys1/kern/src/desc.c
+++ b/sys1/kern/src/desc.c
@@ -4,8 +4,6 @@
 #define SEG_TYPE_CODE	0x00001800
 #define SEG_TYPE_DATA	0x00001000
 #define SEG_TYPE_TSS	0x00000100
-#define SEG_TYPE_INTR	0x00000e00
-#define SEG_TYPE_TRAP	0x00000f00
 
 #define SEG_ACCESSED	0x00000100
 #define SEG_PRESENT		0x00008000
@@ -29,24 +27,16 @@
 
 void desc_seg(struct desc *desc, int type, uint32_t base, uint32_t limit, int dpl)
 {
+	static uint32_t segtype[] = { 0, SEG_TYPE_CODE, SEG_TYPE_DATA, SEG_TYPE_TSS };
+
 	if(type == SEG_NULL) {
 		desc->d[0] = desc->d[1] = 0;
 		return;
 	}
 
 	desc->d[0] = (limit & 0xffff) | (base << 16);
-	desc->d[1] = ((base >> 16) & 0xff) | (type << 8) | SEG_PRESENT | (dpl << 13);
-	desc->d[1] |= (base & 0xff000000) | (limit & 0xf0000) | SEG_AVL | SEG_GRAN;
-
-	switch(type) {
-	case SEG_CODE:
-		desc->d[1] |= (3 << 11) | SEG_DEF | SEG_RD;
-		break;
-
-	case SEG_DATA:
-		desc->d[1] |= (2 << 11) | SEG_WR;
-		break;
-	}
+	desc->d[1] = ((base >> 16) & 0xff) | (type << 8) | SEG_PRESENT | (dpl << 13) | segtype[type];
+	desc->d[1] |= (base & 0xff000000) | (limit & 0xf0000) | SEG_GRAN | SEG_DEF | SEG_RD;
 }