From e72c6dfad556991becbd7d9548c6512a50fe2691 Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Sat, 20 Jun 2020 13:56:29 +0200
Subject: [PATCH] Add drive
---
hal/paging.go | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/hal/paging.go b/hal/paging.go
index ce38223..acc7ed6 100644
--- a/hal/paging.go
+++ b/hal/paging.go
@@ -7,6 +7,7 @@ var defaultRegister uint16 = 0
type Page struct {
Referenced bool
RegisterAddress *uint16
+ Address Address
}
// PageTable uses key as page number
@@ -18,6 +19,9 @@ type MMU struct {
PageTable *PageTable
LoadedPages []*Page
Registers []float64 // 4k registers
+
+ // pseudo hard drive which holds all pages
+ drive map[Address][]float64
}
func (address Address) PageNumber() uint16 {
@@ -45,13 +49,14 @@ func (table PageTable) Find(address Address) {
}
}
+//
func (mmu *MMU) Load(page *Page) {
if len(mmu.LoadedPages) >= 4 {
for index, loadedPage := range mmu.LoadedPages {
if loadedPage.Referenced {
continue
}
- loadedPage.RegisterAddress = nil
+ mmu.movePageToDrive(loadedPage)
mmu.LoadedPages = append(mmu.LoadedPages[:index], mmu.LoadedPages[index+1:]...)
break
}
@@ -80,3 +85,12 @@ func (mmu *MMU) findEmptyRegisterAddress() *uint16 {
return &defaultRegister
}
+
+func (mmu *MMU) movePageToDrive(page *Page) {
+
+ for i := 0; i < PageSize-1; i++ {
+ mmu.drive[page.Address][i] = mmu.Registers[i+int(*page.RegisterAddress)*PageSize]
+ }
+
+ page.RegisterAddress = nil
+}