Summarize the device tree

2025-07-06 01:04:22 +02:00
parent 98a96fba86
commit ff02f911cd
2 changed files with 176 additions and 29 deletions
--- a/kernel.s
+++ b/kernel.s
@@ -30,11 +30,30 @@ kernel_main:
 	la t0, kernel_entry
 	csrw stvec, t0

-	# unimp
-
 	mv a0, a1
 	call device_tree

+	# Prepare the kernel root memory table.
+	la a0, __free_ram
+	li a1, 8
+	call write_x
+
+	la t0, __free_ram
+	srli t0, t0, 10
+	li t1, 0xf0000000
+	or t0, t0, t1
+
+	la t1, __free_ram
+	sw t0, (t1)
+
+	la t0, __free_ram
+	ori t0, t0, 1
+
+	csrw satp, t0
+	sfence.vma zero, zero
+
+
+	# Do nothing in a loop.
 .Lkernel_main:
 	j .Lkernel_main