Get mem mapping from bootloader
This commit is contained in:
Mathieu Maret
parent
77b495e382
commit
8309174f1a
@ -1,5 +1,6 @@
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#pragma once
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#include "stdarg.h"
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#include "minmax.h"
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#define islower(c) (('a' <= (c)) && ((c) <= 'z'))
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#define isupper(c) (('A' <= (c)) && ((c) <= 'Z'))
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50
core/main.c
50
core/main.c
@ -37,7 +37,9 @@ void idleThread(void *arg)
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// https://www.gnu.org/software/grub/manual/multiboot/html_node/Boot-information-format.html#Boot%20information%20format
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void kmain(unsigned long magic, unsigned long addr)
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{
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unsigned long upperMem = 0;
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unsigned long upperMemKB = 0;
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int memMapAvailable = 0;
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paddr_t lastUsedByMem;
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VGASetup(BLACK, GREEN);
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cursorEnable(14, 15);
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@ -53,7 +55,7 @@ void kmain(unsigned long magic, unsigned long addr)
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/* Are mem_* valid? */
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if (CHECK_FLAG(mbi->flags, 0)) {
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printf("mem_lower = %dKiB mem_upper %dKiB\n", mbi->mem_lower, mbi->mem_upper);
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upperMem = mbi->mem_upper;
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upperMemKB = mbi->mem_upper;
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}
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/* Is boot_device valid? */
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@ -79,31 +81,43 @@ void kmain(unsigned long magic, unsigned long addr)
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}
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if (CHECK_FLAG(mbi->flags, 6)) {
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struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr;
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uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry);
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pr_devel("mmap buffer at %d size %d %d\n", mbi->mmap_addr, mbi->mmap_length,
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sizeof(multiboot_memory_map_t));
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for (uint i = 0; i < size; i++) {
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printf("base_addr 0x%x 0x%x, length = 0x%x 0x%x, type = 0x%x\n",
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(unsigned)(mmap[i].addr >> 32), (unsigned)(mmap[i].addr & 0xffffffff),
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(unsigned)(mmap[i].len >> 32), (unsigned)(mmap[i].len & 0xffffffff),
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(uint32_t)mmap[i].type);
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}
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memMapAvailable = 1;
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}
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}
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if (upperMem == 0) {
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if (upperMemKB == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upperMem = 32 * 1024;
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upperMemKB = 32 * 1024;
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}
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printf("Setting up Pagination\n");
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paddr_t lastUserByMem;
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memSetup(upperMem, &lastUserByMem);
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printf("Setting up Mem\n");
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memSetup(upperMemKB, &lastUsedByMem);
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if (memMapAvailable) {
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr;
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uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry);
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pr_devel("mmap buffer at 0x%x with %d entries\n", mbi->mmap_addr, size);
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for (uint i = 0; i < size; i++) {
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printf(" base_addr 0x%x 0x%x, length = 0x%x 0x%x, type = 0x%x\n",
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(unsigned)(mmap[i].addr >> 32), (unsigned)(mmap[i].addr & 0xffffffff),
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(unsigned)(mmap[i].len >> 32), (unsigned)(mmap[i].len & 0xffffffff),
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(uint32_t)mmap[i].type);
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memAddBank(
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max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
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min((multiboot_uint64_t)(upperMemKB * 1024), mmap[i].addr + mmap[i].len),
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mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
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}
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} else {
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printf("Cannot get memory Mapping information, using default value\n");
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memAddBank(0, lastUsedByMem, 0);
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memAddBank(lastUsedByMem, upperMemKB * 1024, 1);
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}
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#ifdef RUN_TEST
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testPhymem();
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#endif
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pagingSetup(lastUserByMem);
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printf("Setting up Pagination\n");
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pagingSetup(lastUsedByMem);
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printf("Setting up IRQ handlers\n");
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irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
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35
core/mem.c
35
core/mem.c
@ -7,50 +7,49 @@
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static struct memDesc *pageDesc = (struct memDesc *)&__ld_kernel_end;
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static struct memDesc *freePage;
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static struct memDesc *usedPage;
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static unsigned long memBottom;
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static unsigned long memTop;
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static unsigned long allocatedPage = 0;
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int memSetup(paddr_t upperMem, paddr_t *lastPageUsedOut)
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int memSetup(paddr_t upperMemKB, paddr_t *lastMemUsedOut)
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{
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list_init(freePage);
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list_init(usedPage);
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// Align upper mem (in kB) on page size even if it does loose a page
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upperMem = ALIGN_DOWN(upperMem, PAGE_SIZE / 1024);
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unsigned long nbPage = ((upperMem) / (PAGE_SIZE / 1024));
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upperMemKB = ALIGN_DOWN(upperMemKB, PAGE_SIZE / 1024);
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unsigned long nbPage = ((upperMemKB) / (PAGE_SIZE / 1024));
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printf("Available Mem from 0x%x to 0x%x: %dMB and %dPages(%d)\n", &__ld_kernel_end,
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upperMem * 1024, (upperMem * 1024 - (uint32_t)&__ld_kernel_end) / (1024 * 1024),
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upperMemKB * 1024, (upperMemKB * 1024 - (uint32_t)&__ld_kernel_end) / (1024 * 1024),
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nbPage, PAGE_SIZE);
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// Memory description is stored after the kernel. We need some place to store it
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unsigned long pageDescEnd = (unsigned long)pageDesc + nbPage * sizeof(struct memDesc);
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uint lastPageUsed = (pageDescEnd >> PAGE_SHIFT) + 1;
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memBottom = lastPageUsed << PAGE_SHIFT;
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memTop = upperMem * 1024;
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*lastPageUsedOut = pageDescEnd;
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*lastMemUsedOut = ALIGN(pageDescEnd, PAGE_SIZE);
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for (uint i = 0; i < nbPage; i++) {
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memAddBank(0, *lastMemUsedOut, 0);
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return 0;
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}
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int memAddBank(paddr_t bottomMem, paddr_t topMem, int isFree)
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{
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for (uint i = (bottomMem >> PAGE_SHIFT); i < (topMem >> PAGE_SHIFT); i++) {
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struct memDesc *mem = &pageDesc[i];
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if (i < lastPageUsed) {
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mem->ref = 1;
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list_add_tail(usedPage, mem);
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} else {
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if (isFree) {
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mem->ref = 0;
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list_add_tail(freePage, mem);
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} else {
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mem->ref = 1;
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list_add_tail(usedPage, mem);
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}
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mem->phy_addr = i * PAGE_SIZE;
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}
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return 0;
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}
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struct memDesc *addr2memDesc(paddr_t addr)
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{
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if (addr > memTop || addr < memBottom)
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return NULL;
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int idx = addr >> PAGE_SHIFT;
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return pageDesc + idx;
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}
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@ -16,6 +16,7 @@ struct memDesc {
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};
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int memSetup(paddr_t upperMem, paddr_t *lastUsed);
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int memAddBank(paddr_t bottomMem, paddr_t topMem, int isFree);
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paddr_t allocPhyPage(uint nbPage);
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int unrefPhyPage(paddr_t addr);
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int refPhyPage(paddr_t addr);
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169
core/minmax.h
Normal file
169
core/minmax.h
Normal file
@ -0,0 +1,169 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MINMAX_H
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#define _LINUX_MINMAX_H
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/*
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* From linux kernel include/linux/compiler_types.h
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*/
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#define ___PASTE(a,b) a##b
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#define __PASTE(a,b) ___PASTE(a,b)
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/*
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* From Linux kernel include/linux/compiler.h
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*/
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/* Not-quite-unique ID. */
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#ifndef __UNIQUE_ID
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# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
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#endif
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/*
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* min()/max()/clamp() macros must accomplish three things:
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*
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* - avoid multiple evaluations of the arguments (so side-effects like
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* "x++" happen only once) when non-constant.
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* - perform strict type-checking (to generate warnings instead of
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* nasty runtime surprises). See the "unnecessary" pointer comparison
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* in __typecheck().
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* - retain result as a constant expressions when called with only
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* constant expressions (to avoid tripping VLA warnings in stack
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* allocation usage).
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*/
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#define __typecheck(x, y) \
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(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
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/*
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* This returns a constant expression while determining if an argument is
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* a constant expression, most importantly without evaluating the argument.
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* Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
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*/
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#define __is_constexpr(x) \
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(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
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#define __no_side_effects(x, y) \
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(__is_constexpr(x) && __is_constexpr(y))
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#define __safe_cmp(x, y) \
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(__typecheck(x, y) && __no_side_effects(x, y))
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#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
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#define __cmp_once(x, y, unique_x, unique_y, op) ({ \
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typeof(x) unique_x = (x); \
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typeof(y) unique_y = (y); \
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__cmp(unique_x, unique_y, op); })
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#define __careful_cmp(x, y, op) \
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__builtin_choose_expr(__safe_cmp(x, y), \
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__cmp(x, y, op), \
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__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
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/**
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* min - return minimum of two values of the same or compatible types
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* @x: first value
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* @y: second value
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*/
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#define min(x, y) __careful_cmp(x, y, <)
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/**
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* max - return maximum of two values of the same or compatible types
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* @x: first value
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* @y: second value
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*/
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#define max(x, y) __careful_cmp(x, y, >)
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/**
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* min3 - return minimum of three values
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* @x: first value
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* @y: second value
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* @z: third value
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*/
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#define min3(x, y, z) min((typeof(x))min(x, y), z)
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/**
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* max3 - return maximum of three values
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* @x: first value
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* @y: second value
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* @z: third value
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*/
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#define max3(x, y, z) max((typeof(x))max(x, y), z)
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/**
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* min_not_zero - return the minimum that is _not_ zero, unless both are zero
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* @x: value1
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* @y: value2
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*/
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#define min_not_zero(x, y) ({ \
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typeof(x) __x = (x); \
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typeof(y) __y = (y); \
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__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
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/**
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* clamp - return a value clamped to a given range with strict typechecking
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* @val: current value
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* @lo: lowest allowable value
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* @hi: highest allowable value
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*
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* This macro does strict typechecking of @lo/@hi to make sure they are of the
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* same type as @val. See the unnecessary pointer comparisons.
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*/
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#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
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/*
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* ..and if you can't take the strict
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* types, you can specify one yourself.
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*
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* Or not use min/max/clamp at all, of course.
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*/
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/**
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* min_t - return minimum of two values, using the specified type
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* @type: data type to use
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* @x: first value
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* @y: second value
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*/
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#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
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/**
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* max_t - return maximum of two values, using the specified type
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* @type: data type to use
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* @x: first value
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* @y: second value
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*/
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#define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
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/**
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* clamp_t - return a value clamped to a given range using a given type
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* @type: the type of variable to use
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* @val: current value
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* @lo: minimum allowable value
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* @hi: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of type
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* @type to make all the comparisons.
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*/
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#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
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/**
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* clamp_val - return a value clamped to a given range using val's type
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* @val: current value
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* @lo: minimum allowable value
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* @hi: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of whatever
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* type the input argument @val is. This is useful when @val is an unsigned
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* type and @lo and @hi are literals that will otherwise be assigned a signed
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* integer type.
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*/
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#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
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/**
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* swap - swap values of @a and @b
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* @a: first value
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* @b: second value
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*/
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#define swap(a, b) \
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do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
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#endif /* _LINUX_MINMAX_H */
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@ -14,8 +14,6 @@
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void testPhymem(void)
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{
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printf("Testing memory PHY\n");
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assert(refPhyPage((paddr_t)(&__ld_kernel_end)) == -1);
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assert(refPhyPage((paddr_t)(&__ld_kernel_begin)) == -1);
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struct memDesc *allocated_page_list;
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struct memDesc
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*page; // Cast in mem_desc to use it. In fact it's the addr of 4K free memory
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