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-rw-r--r--Source/Kernel/Makefile2
-rw-r--r--Source/Kernel/MemoryManager/KernelSegment.class.cpp51
-rw-r--r--Source/Kernel/MemoryManager/KernelSegment.class.h25
-rw-r--r--Source/Kernel/MemoryManager/Mem.ns.cpp4
-rw-r--r--Source/Kernel/MemoryManager/PageAlloc.ns.cpp9
-rw-r--r--Source/Kernel/MemoryManager/PageDirectory.class.cpp65
-rw-r--r--Source/Kernel/MemoryManager/PageDirectory.class.h17
-rw-r--r--Source/Kernel/MemoryManager/PhysMem.ns.cpp37
-rw-r--r--Source/Kernel/MemoryManager/PhysMem.ns.h8
-rw-r--r--Source/Kernel/MemoryManager/Segment.proto.h24
-rw-r--r--Source/Kernel/MemoryManager/V86Segment.class.cpp16
-rw-r--r--Source/Kernel/MemoryManager/V86Segment.class.h12
-rw-r--r--Source/Kernel/TaskManager/V86/V86.ns.cpp7
-rw-r--r--Source/Kernel/TaskManager/V86/V86.ns.h1
14 files changed, 75 insertions, 203 deletions
diff --git a/Source/Kernel/Makefile b/Source/Kernel/Makefile
index 233b23b..6a44ecf 100644
--- a/Source/Kernel/Makefile
+++ b/Source/Kernel/Makefile
@@ -21,8 +21,6 @@ Objects = Core/loader.wtf.o \
MemoryManager/GDT.ns.o \
MemoryManager/PageDirectory.class.o \
MemoryManager/PageAlloc.ns.o \
- MemoryManager/KernelSegment.class.o \
- MemoryManager/V86Segment.class.o \
DeviceManager/Disp.ns.o \
DeviceManager/Dev.ns.o \
DeviceManager/Time.ns.o \
diff --git a/Source/Kernel/MemoryManager/KernelSegment.class.cpp b/Source/Kernel/MemoryManager/KernelSegment.class.cpp
deleted file mode 100644
index 154ae46..0000000
--- a/Source/Kernel/MemoryManager/KernelSegment.class.cpp
+++ /dev/null
@@ -1,51 +0,0 @@
-#include "KernelSegment.class.h"
-#include <MemoryManager/PageAlloc.ns.h>
-#include <MemoryManager/PhysMem.ns.h>
-#include <MemoryManager/PageDirectory.class.h>
-
-seg_map_t KernelSegment::map(PageDirectory* pd) {
- for (u32int i = 0; i < 256; i++) {
- pd->tables[i + 768] = tables[i];
- pd->tablesPhysical[i + 768] = tablesPhysical[i];
- }
- m_pds.push(pd);
- seg_map_t ret = {this, 0xC0000000, 0x40000000};
- return ret;
-}
-
-page_t* KernelSegment::getPage(u32int addr) {
- if (addr < 0xC0000000) return 0;
- addr /= 0x1000;
- u32int tableIdx = addr / 1024;
- if (tables[tableIdx - 768] == 0) {
- tables[tableIdx - 768] = (page_table_t*)PageAlloc::alloc(tablesPhysical + tableIdx - 768);
- CMem::memset((u8int*)tables[tableIdx - 768], 0, 0x1000);
- for (u32int i = 0; i < m_pds.size(); i++) {
- m_pds[i]->tables[tableIdx] = tables[tableIdx - 768];
- m_pds[i]->tablesPhysical[tableIdx] = tablesPhysical[tableIdx - 768];
- }
- }
- return &tables[tableIdx - 768]->pages[addr % 1024];
-}
-
-bool KernelSegment::allocFrame(u32int addr) {
- page_t *p = getPage(addr);
- if (p == 0) return false;
- if (p->frame != 0) return false;
- PageDirectory::map(p, PhysMem::getFrame(), false, false);
- return true;
-}
-
-void KernelSegment::identityMap(u32int addr) {
- page_t *p = getPage(addr);
- if (p == 0) return;
- PageDirectory::map(p, (addr - 0xC0000000) / 0x1000, false, false);
-}
-
-void KernelSegment::freeFrame(u32int addr) {
- if (addr < 0xC0000000) return;
- addr /= 0x1000;
- u32int tableIdx = addr / 1024;
- if (tables[tableIdx - 768] == 0) return;
- PageDirectory::unmap(&tables[tableIdx - 768]->pages[addr % 1024], true);
-}
diff --git a/Source/Kernel/MemoryManager/KernelSegment.class.h b/Source/Kernel/MemoryManager/KernelSegment.class.h
deleted file mode 100644
index 4d8205a..0000000
--- a/Source/Kernel/MemoryManager/KernelSegment.class.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef DEF_KERNEL_SEGMENT_CLASS_H
-#define DEF_KERNEL_SEGMENT_CLASS_H
-
-#include <MemoryManager/Segment.proto.h>
-#include <MemoryManager/PageDirectory.class.h>
-
-class KernelSegment : public Segment {
- private:
- Vector<PageDirectory*> m_pds;
- page_table_t *tables[256];
- u32int tablesPhysical[256];
-
- page_t* getPage(u32int addr);
-
- public:
- seg_map_t map(PageDirectory *pd);
- void unmap(PageDirectory *pd, seg_map_t *mapping) {}
- bool handleFault(u32int addr, seg_map_t *mapping) { return false; }
-
- bool allocFrame(u32int addr); //false when page already was mapped to a frame
- void identityMap(u32int addr); //Used only on paging initialisation
- void freeFrame(u32int addr);
-};
-
-#endif
diff --git a/Source/Kernel/MemoryManager/Mem.ns.cpp b/Source/Kernel/MemoryManager/Mem.ns.cpp
index 712c0f3..a0809b0 100644
--- a/Source/Kernel/MemoryManager/Mem.ns.cpp
+++ b/Source/Kernel/MemoryManager/Mem.ns.cpp
@@ -20,7 +20,7 @@ void *kallocInternal(size_t sz, bool align) {
u32int temp = placementAddress;
placementAddress += sz;
for (u32int i = temp; i < placementAddress; i += 0x1000) {
- if (pagingEnabled) PhysMem::keSeg.allocFrame(i);
+ if (pagingEnabled) kernelPageDirectory->allocFrame(i, false, false);
}
return (void*)temp;
}
@@ -34,7 +34,7 @@ void createHeap() {
u32int heapSize = HEAP_MIN_SIZE + heapIndexSize; //Calculate heap size
for (u32int i = (placementAddress & 0xFFFFF000); i < heapStart; i += 0x1000) {
- PhysMem::keSeg.allocFrame(i);
+ kernelPageDirectory->allocFrame(i, false, false);
}
kheap.create(heapStart, heapSize, heapIndexSize, kernelPageDirectory, false, false);
diff --git a/Source/Kernel/MemoryManager/PageAlloc.ns.cpp b/Source/Kernel/MemoryManager/PageAlloc.ns.cpp
index 1b9a322..d8ede2a 100644
--- a/Source/Kernel/MemoryManager/PageAlloc.ns.cpp
+++ b/Source/Kernel/MemoryManager/PageAlloc.ns.cpp
@@ -29,10 +29,13 @@ void* alloc(u32int* phys) {
next = Mem::alloc(0x1000, true);
} else {
u32int i = 0xFFFFF000;
+ page_t *p;
while (1) {
- if (PhysMem::keSeg.allocFrame(i)) break;
+ p = kernelPageDirectory->getPage(i, true);
+ if (p->frame == 0) break;
i -= 0x1000;
}
+ PhysMem::allocFrame(p, true, false);
next = (void*)i;
}
freePage[freec] = next;
@@ -49,7 +52,7 @@ void* alloc(u32int* phys) {
if (p == 0) { //THIS SHOULD NEVER HAPPEN
PANIC("Cached free page does not exist.");
} else if (p->frame == 0) {
- PageDirectory::map(p, PhysMem::getFrame(), true, false);
+ PhysMem::allocFrame(p, true, false);
} else {
*phys = (p->frame * 0x1000);
}
@@ -58,7 +61,7 @@ void* alloc(u32int* phys) {
}
void free(void *ptr) {
- PhysMem::keSeg.freeFrame((u32int)ptr);
+ kernelPageDirectory->freeFrame((u32int)ptr);
return;
}
diff --git a/Source/Kernel/MemoryManager/PageDirectory.class.cpp b/Source/Kernel/MemoryManager/PageDirectory.class.cpp
index 575b14c..064b423 100644
--- a/Source/Kernel/MemoryManager/PageDirectory.class.cpp
+++ b/Source/Kernel/MemoryManager/PageDirectory.class.cpp
@@ -5,23 +5,6 @@
extern "C" void copy_page_physical(u32int src, u32int dest);
-/* FOR MAPPING FRAMES TO PAGES */
-void PageDirectory::map(page_t* p, u32int frame, bool is_user, bool is_writable) {
- if (p == 0) return;
- p->present = 1;
- p->user = (is_user ? 1 : 0);
- p->rw = (is_writable ? 1 : 0);
- p->frame = (frame);
-}
-
-void PageDirectory::unmap(page_t *p, bool freePhys) {
- if (p == 0) return;
- if (freePhys) PhysMem::freeFrame(p->frame);
- p->present = 0;
- p->frame = 0;
-}
-
-/* FOR PAGE DIRECTORES */
PageDirectory::PageDirectory() {
tablesPhysical = (u32int*)PageAlloc::alloc(&physicalAddr);
for (u32int i = 0; i < 1024; i++) {
@@ -41,7 +24,7 @@ PageDirectory::PageDirectory(PageDirectory* other) {
if (!(other->tables[i]->pages[j].frame))
continue;
if (i == 0 and j < 256) continue; //Frame is below 1M, probably used by some V86 stuff. Ignore it.
- map(&tables[i]->pages[j], PhysMem::getFrame(), true, true);
+ PhysMem::allocFrame(&tables[i]->pages[j], true, true);
tables[i]->pages[j].present = other->tables[i]->pages[j].present;
tables[i]->pages[j].rw = other->tables[i]->pages[j].rw;
tables[i]->pages[j].user = other->tables[i]->pages[j].user;
@@ -61,48 +44,58 @@ PageDirectory::PageDirectory(PageDirectory* other) {
}
PageDirectory::~PageDirectory() {
- for (u32int i = 0; i < mappedSegs.size(); i++) {
- mappedSegs[i].seg->unmap(this, &mappedSegs[i]);
- }
for (int i = 0; i < 768; i++) { //Only free addresses below 0xC0000000, upper is kernel space
if (tables[i] != 0) {
+ for (int j = 0; j < 1024; j++) {
+ if (i == 0 and j < 256) continue; //Frame is below 1M, probably used by some V86 stuff. Ignore it.
+ PhysMem::freeFrame(&(tables[i]->pages[j]));
+ }
PageAlloc::free((void*)tables[i]);
}
}
PageAlloc::free((void*)tablesPhysical);
}
-void PageDirectory::map(Segment* seg) {
- mappedSegs.push(seg->map(this));
-}
-
-void PageDirectory::unmap(Segment* seg) {
- for (u32int i = 0; i < mappedSegs.size(); i++) {
- if (mappedSegs[i].seg == seg) {
- seg->unmap(this, &mappedSegs[i]);
- mappedSegs[i] = mappedSegs.back();
- return;
- }
- }
-}
-
page_t *PageDirectory::getPage(u32int address, bool make) {
address /= 0x1000;
u32int tableIdx = address / 1024;
if (tables[tableIdx] != 0) {
return &(tables[tableIdx]->pages[address % 1024]);
} else if (make) {
- if (address >= 0xC0000000) return 0;
u32int tmp;
tables[tableIdx] = (page_table_t*)PageAlloc::alloc(&tmp);
CMem::memset((u8int*)tables[tableIdx], 0, 0x1000);
tablesPhysical[tableIdx] = tmp | 0x07;
+ if (tableIdx >= 768)
+ Task::allocKernelPageTable(tableIdx, tables[tableIdx], tablesPhysical[tableIdx]);
return &(tables[tableIdx]->pages[address % 1024]);
} else {
return 0;
}
}
+void PageDirectory::map(page_t* p, u32int frame, bool is_user, bool is_writable) {
+ p->present = 1;
+ p->user = (is_user ? 1 : 0);
+ p->rw = (is_writable ? 1 : 0);
+ p->frame = (frame);
+}
+
+void PageDirectory::allocFrame(u32int address, bool is_user, bool is_writable) {
+ page_t *p = getPage(address, true);
+ if (address < 0x100000) {
+ map(p, address / 0x1000, is_user, is_writable);
+ } else {
+ if (p != 0) PhysMem::allocFrame(p, is_user, is_writable);
+ }
+}
+
+void PageDirectory::freeFrame(u32int address) {
+ page_t *p = getPage(address, false);
+ if (p == 0) return;
+ PhysMem::freeFrame(p);
+}
+
void PageDirectory::switchTo() {
asm volatile("mov %0, %%cr3" :: "r"(physicalAddr));
u32int cr0;
diff --git a/Source/Kernel/MemoryManager/PageDirectory.class.h b/Source/Kernel/MemoryManager/PageDirectory.class.h
index c3403aa..e93524b 100644
--- a/Source/Kernel/MemoryManager/PageDirectory.class.h
+++ b/Source/Kernel/MemoryManager/PageDirectory.class.h
@@ -2,8 +2,6 @@
#define DEF_PAGEDIRECTORY_CLASS_H
#include <common.h>
-#include <Vector.class.h>
-#include <MemoryManager/Segment.proto.h>
struct page_t {
u32int present : 1;
@@ -24,21 +22,14 @@ struct PageDirectory {
u32int *tablesPhysical;
u32int physicalAddr;
- Vector<seg_map_t> mappedSegs;
-
- //For mapping a page to a frame
- static void map(page_t *p, u32int frame, bool is_user, bool is_writable);
- static void unmap(page_t *p, bool physFree = false);
-
PageDirectory();
PageDirectory(PageDirectory* other); //Clones the other pagedir
~PageDirectory();
- void switchTo();
page_t *getPage(u32int address, bool make);
-
- //For mapping memory segments to the page directory
- void map(Segment* seg);
- void unmap(Segment* seg);
+ void map(page_t *p, u32int frame, bool is_user, bool is_writable);
+ void allocFrame(u32int address, bool is_user, bool is_writable);
+ void freeFrame(u32int address);
+ void switchTo();
private:
PageDirectory(const PageDirectory& other);
diff --git a/Source/Kernel/MemoryManager/PhysMem.ns.cpp b/Source/Kernel/MemoryManager/PhysMem.ns.cpp
index d3ce0b9..54eb4de 100644
--- a/Source/Kernel/MemoryManager/PhysMem.ns.cpp
+++ b/Source/Kernel/MemoryManager/PhysMem.ns.cpp
@@ -9,21 +9,17 @@ namespace PhysMem {
u32int nframes;
Bitset *frames;
-KernelSegment keSeg;
-
void initPaging(u32int mem_size) {
nframes = mem_size / 0x1000;
frames = new Bitset(nframes);
- for (u32int i = 0; i < Mem::placementAddress / 0x1000; i++) frames->setBit(i);
-
kernelPageDirectory = new (Mem::alloc(sizeof(PageDirectory), true)) PageDirectory();
- kernelPageDirectory->map(&keSeg);
u32int i = 0xC0000000;
while (i < Mem::placementAddress) {
- keSeg.identityMap(i);
+ page_t *p2 = kernelPageDirectory->getPage(i, true);
+ allocFrame(p2, false, false);
i += 0x1000;
}
//Also map thoses pages at begning of virtual memory
@@ -46,15 +42,30 @@ void removeTemporaryPages() {
}
}
-u32int getFrame() {
- u32int idx = frames->firstFreeBit();
- if (idx == (u32int) - 1) PANIC("No more free frames !");
- frames->setBit(idx);
- return idx;
+void allocFrame(page_t *page, bool is_user, bool is_writable) {
+ if (page->frame != 0) {
+ return;
+ } else {
+ u32int idx = frames->firstFreeBit();
+ if (idx == (u32int) - 1) PANIC("No more free frames !");
+ frames->setBit(idx);
+ page->present = 1;
+ page->user = (is_user ? 1 : 0);
+ page->rw = (is_writable ? 1 : 0);
+ page->frame = idx;
+ }
}
-void freeFrame(u32int frame) {
- frames->clearBit(frame);
+void freeFrame(page_t *page) {
+ if (page->frame == 0) {
+ return;
+ } else {
+ if (page->frame >= 0x100) { //First 1M are reserved (system)
+ frames->clearBit(page->frame);
+ }
+ page->present = 0;
+ page->frame = 0;
+ }
}
u32int free() {
diff --git a/Source/Kernel/MemoryManager/PhysMem.ns.h b/Source/Kernel/MemoryManager/PhysMem.ns.h
index 3e6ec55..258591a 100644
--- a/Source/Kernel/MemoryManager/PhysMem.ns.h
+++ b/Source/Kernel/MemoryManager/PhysMem.ns.h
@@ -3,21 +3,17 @@
#include <MemoryManager/PageDirectory.class.h>
-#include <MemoryManager/KernelSegment.class.h>
-
extern PageDirectory* kernelPageDirectory;
namespace PhysMem {
void initPaging(u32int mem_size);
void removeTemporaryPages();
- u32int getFrame();
- void freeFrame(u32int frame);
+ void allocFrame(page_t *page, bool is_user, bool is_writable);
+ void freeFrame(page_t *page);
u32int free();
u32int total();
-
- extern KernelSegment keSeg;
}
#endif
diff --git a/Source/Kernel/MemoryManager/Segment.proto.h b/Source/Kernel/MemoryManager/Segment.proto.h
deleted file mode 100644
index 780cd10..0000000
--- a/Source/Kernel/MemoryManager/Segment.proto.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#ifndef DEF_SEGMENT_PROTO_H
-#define DEF_SEGMENT_PROTO_H
-
-#include <common.h>
-
-class PageDirectory;
-class Segment;
-
-struct seg_map_t {
- Segment* seg;
- u32int start;
- u32int len;
-};
-
-class Segment {
- public:
- virtual seg_map_t map(PageDirectory *pd) = 0;
- virtual void unmap(PageDirectory *pd, seg_map_t *mapping) = 0;
- virtual bool handleFault(u32int addr, seg_map_t *mapping) = 0; //true = ok, false = app segfaulted
-
- virtual Segment* clone() { return this; }
-};
-
-#endif
diff --git a/Source/Kernel/MemoryManager/V86Segment.class.cpp b/Source/Kernel/MemoryManager/V86Segment.class.cpp
deleted file mode 100644
index e82a94c..0000000
--- a/Source/Kernel/MemoryManager/V86Segment.class.cpp
+++ /dev/null
@@ -1,16 +0,0 @@
-#include "V86Segment.class.h"
-#include <MemoryManager/PageDirectory.class.h>
-
-seg_map_t V86Segment::map(PageDirectory *pd) {
- for (u32int i = 0; i < 0x100000; i += 0x1000) {
- PageDirectory::map(pd->getPage(i, true), i / 0x1000, true, true);
- }
- seg_map_t map = {this, 0, 0x100000};
- return map;
-}
-
-void V86Segment::unmap(PageDirectory* pd, seg_map_t *mapping) {
- for (u32int i = 0; i < 0x100000; i += 0x1000) {
- PageDirectory::unmap(pd->getPage(i, false));
- }
-}
diff --git a/Source/Kernel/MemoryManager/V86Segment.class.h b/Source/Kernel/MemoryManager/V86Segment.class.h
deleted file mode 100644
index 665506d..0000000
--- a/Source/Kernel/MemoryManager/V86Segment.class.h
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef DEF_V86SEGMENT_CLASS_H
-#define DEF_V86SEGMENT_CLASS_H
-
-#include <MemoryManager/Segment.proto.h>
-
-class V86Segment : public Segment {
- seg_map_t map(PageDirectory *pd);
- void unmap(PageDirectory* pd, seg_map_t *mapping);
- bool handleFault(u32int addr, seg_map_t *mapping) { return false; }
-};
-
-#endif
diff --git a/Source/Kernel/TaskManager/V86/V86.ns.cpp b/Source/Kernel/TaskManager/V86/V86.ns.cpp
index f6cc641..f70728c 100644
--- a/Source/Kernel/TaskManager/V86/V86.ns.cpp
+++ b/Source/Kernel/TaskManager/V86/V86.ns.cpp
@@ -19,6 +19,13 @@ void biosInt(u8int int_no, v86_regs_t &regs) {
while (!ret.finished) Task::currThread()->sleep(10);
}
+void map(Process* p) {
+ if (p == 0) p = Task::currProcess();
+ for (u32int i = 0x00000; i < 0xFFFFF; i += 0x1000) {
+ p->getPagedir()->allocFrame(i, true, true);
+ }
+}
+
u16int allocSeg(u16int length) {
if (length & 0xF) length = (length & 0xFFFF0) + 0x10;
u16int segments = length / 16;
diff --git a/Source/Kernel/TaskManager/V86/V86.ns.h b/Source/Kernel/TaskManager/V86/V86.ns.h
index d30c08e..ec8e928 100644
--- a/Source/Kernel/TaskManager/V86/V86.ns.h
+++ b/Source/Kernel/TaskManager/V86/V86.ns.h
@@ -26,6 +26,7 @@ namespace V86 {
void run(v86_function_t& entry, v86_regs_t &regs);
void biosInt(u8int int_no, v86_regs_t &regs);
+ void map(Process* p = 0); //Maps lower 1MB of virtual memory to physical memory (lower 1MB as well)
u16int allocSeg(u16int size);
void* alloc(u16int size);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 23:08:49 +0000