From: Nathan Wagner <nw@hydaspes.if.org>
Date: Tue, 25 Oct 2016 01:31:35 +0000 (-0500)
Subject: low level assembly for amd64 memory
X-Git-Url: https://pd.if.org/git/?p=zos;a=commitdiff_plain;h=bbbb05357f8c1c4e2f4fc039a6b2794e88e63114

low level assembly for amd64 memory
---

diff --git a/memx64.s b/memx64.s
new file mode 100644
index 0000000..f0b63cb
--- /dev/null
+++ b/memx64.s
@@ -0,0 +1,23 @@
+global flush_tlb:function
+global switch_address_space:function
+
+flush_tlb:
+	invlpg [rdi]
+	ret
+
+switch_address_space:
+	; clear the reserved bits
+	mov rax, 0x000FFFFFFFFFF018
+	and rax, rdi
+
+	mov cr3, rax
+	ret
+
+global getcr3:function
+getcr3:
+	mov rax, cr3
+	ret
+
+section .data
+switchp:
+	db 'switching to space %llx', 0xA, 0