From 598b964ee3c1fab162bfc85fa3725501ab238881 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Fri, 31 Mar 2023 18:41:36 -0400
Subject: entry.s and kernel.ld

---
 kernel/boot/entry.S  | 36 ++++++++++++++++++++++++++++++++++++
 kernel/lds/kernel.ld | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 kernel/boot/entry.S
 create mode 100644 kernel/lds/kernel.ld

(limited to 'kernel')

diff --git a/kernel/boot/entry.S b/kernel/boot/entry.S
new file mode 100644
index 0000000..4c977a3
--- /dev/null
+++ b/kernel/boot/entry.S
@@ -0,0 +1,36 @@
+.section .text.init
+
+.globl _start
+_start:
+        csrw       satp, zero
+        csrw       sie, zero
+        csrw       sip, zero
+
+        .option push
+        .option norelax
+        la         gp, __global_pointer$
+        .option pop
+
+        la         sp, __stack_start
+        mv         t0, a0
+        li         t1, PAGE_SIZE 
+        mul        t0, t0, t1
+        add        sp, sp, t0
+
+        li         a2, 1
+        lla        a3, _boot_hart
+        amoswap.w, a3, a2, (a3)
+        bnez a3,   mp_entry 
+
+        la         a2, __bss_start
+        la         a3, __bss_end
+1:
+        sd         zero, (a2)
+        addi       a2, a2, __SIZEOF_POINTER__
+        blt        a2, a3, 1b 
+        
+        call       boot
+
+_boot_hart:
+        .dword 0
+
diff --git a/kernel/lds/kernel.ld b/kernel/lds/kernel.ld
new file mode 100644
index 0000000..052aa32
--- /dev/null
+++ b/kernel/lds/kernel.ld
@@ -0,0 +1,47 @@
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+
+SECTIONS
+{
+        . = LOAD_ADDR;
+        . = ALIGN(PAGE_SIZE);
+
+        .text :
+        {
+                provide(__text_start = .);
+                *(.text.init)
+                *(.text .text.*)
+                . = ALIGN(8);
+                PROVIDE(__text_end = .);
+        }
+        .  = ALIGN(PAGE_SIZE);
+
+        PROVIDE(__global_pointer$ = .);
+
+        .rodata :
+        {
+                PROVIDE(__rodata_start = .);
+                *(.rodata .rodata.*)
+                . = ALIGN(8);
+                PROVIDE(__rodata_end = .); 
+        }
+
+        . = ALIGN(PAGE_SIZE);
+
+        .data : 
+        {
+                PROVIDE(__data_start = .);
+                *(.sdata .sdata.*) 
+                *(.data .data.*)
+                *(.readmostly.data)
+                *(*.data)
+                . = ALIGN(8);
+                PROVIDE(__data_end = .);
+        }
+
+        . = ALIGN(PAGE_SIZE); 
+
+        PROVIDE(__stack_start = .);
+        PROVIDE(__stack_end = __stack_start + (PAGE_SIZE * NPROC));
+        PROVIDE(__heap_start = __stack_end);
+}
-- 
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