From f13b26eeb4f9afba3a1aed2516655b34139979aa Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Tue, 27 Apr 2021 19:02:17 +0200
Subject: Making kernel Higher-Half

---
 src/linker.ld | 49 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 17 deletions(-)

(limited to 'src/linker.ld')

diff --git a/src/linker.ld b/src/linker.ld
index 89e4909..7d7c3a6 100644
--- a/src/linker.ld
+++ b/src/linker.ld
@@ -1,30 +1,45 @@
-ENTRY(_start)
 OUTPUT_FORMAT(elf64-x86-64)
+ENTRY(_start)
 
-SECTIONS {
+__kernel_vma = 0xFFFFFFFF80000000;
+__boot_pma = 1M;
+__stack_pma = 0x3FFFFF;
+__stack_size = 4096;
+__userspace_pma = 0x400000;
 
-    . = 1M;
+PHDRS
+{
+    boot PT_LOAD;
+    kernel PT_LOAD;
+}
 
-    .text : ALIGN(4)
+SECTIONS {
+    . = __boot_pma;
+    .boot ALIGN(4096) :
     {
         *boot.o(.multiboot)
         *boot.o(.text)
-        *(.text)
-    }
-    .rodata : ALIGN(4)
-    {
-        *(.rodata)
-    }
-    .data : ALIGN(4)
+        *trampoline.o(.text .text.* .data .data.* .rodata .rodata.* .bss)
+
+    } :boot
+
+    . += __kernel_vma;
+    .text ALIGN(4096) : AT(ADDR(.text)-__kernel_vma)
     {
-        *(.data)
-    }
-    .bss : ALIGN(4)
+        *boot.o(.multiboot)
+        *boot.o(.text)
+        *(.text .text.*)
+        *(.rodata .rodata.*)
+        *(.data .data.*)
+    }:kernel
+    .bss ALIGN(4096) : AT(ADDR(.bss)-__kernel_vma) 
     {
-        _bss_start = .;
+        __bss_start = .;
         *(.bss);
-        _bss_end = .;
+        __bss_end = .;
         *(COMMON);
-    }
+        ASSERT( (. - ABSOLUTE(__kernel_vma)) < (ABSOLUTE(__stack_pma)-ABSOLUTE(__stack_size)), "No room for stack !!");
+    }:kernel
 
+    /DISCARD/ : { *(.eh_frame) *(.comment)  *(.note*) }
 }
\ No newline at end of file
-- 
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