From edf9e71e2a7b6b89775c29cf28c19c6b89992c25 Mon Sep 17 00:00:00 2001
From: aqua <aqua@iserlohn-fortress.net>
Date: Mon, 28 Mar 2022 20:03:38 +0300
Subject: Initial commit

x86 kernel that prints a hello world message to com1
---
 arch/i686/macros.s | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 arch/i686/macros.s

(limited to 'arch/i686/macros.s')

diff --git a/arch/i686/macros.s b/arch/i686/macros.s
new file mode 100644
index 0000000..a9b8b4d
--- /dev/null
+++ b/arch/i686/macros.s
@@ -0,0 +1,25 @@
+.set PAGE_RO, 0x001
+.set PAGE_RW, 0x003
+/* write section to page table macro
+ *
+ * Registers used:
+ * %ecx: loop counter   [ set to $1024 ]
+ * %edx: temporary
+ * %esi: current page being mapped
+ * %edi: page entry     [ set to $page_addr ]
+ */
+.macro mmap_section begin, end, access
+    mov  $\begin, %esi  # from $begin
+1:  cmpl $\end, %esi    # until $end
+    jge  2f
+
+    movl %esi, %edx
+    orl  $\access, %edx
+    movl %edx, (%edi)
+
+    addl $4096, %esi    # move to next page
+    addl $4, %edi       # size of page entry is 4 bytes
+    loop 1b             # loop according to %ecx
+2:
+.endm
+
-- 
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