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#include "vmm.h"
typedef void (*constructor)();
extern "C" {
/* .text */
uint32_t begin_text;
uint32_t end_text;
/* .rodata */
uint32_t begin_rodata;
uint32_t end_rodata;
/* .data */
uint32_t begin_constinit;
uint32_t end_constinit;
constructor begin_ctors;
constructor end_ctors;
uint32_t begin_data;
uint32_t end_data;
/* .bss */
uint32_t begin_bss;
uint32_t end_bss;
void kernel_constructors() {
for (constructor* i = &begin_ctors; i != &end_ctors; ++i) (*i)();
}
void dump_address() {
printk("text begin: ", uhex{reinterpret_cast<uint32_t>(&begin_text)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_text)}, '\n');
printk("rodata begin: ", uhex{reinterpret_cast<uint32_t>(&begin_rodata)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_rodata)}, '\n');
printk("constinit begin: ", uhex{reinterpret_cast<uint32_t>(&begin_constinit)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_constinit)}, '\n');
printk("ctors begin: ", uhex{reinterpret_cast<uint32_t>(&begin_ctors)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_ctors)}, '\n');
printk("data begin: ", uhex{reinterpret_cast<uint32_t>(&begin_data)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_data)}, '\n');
printk("bss begin: ", uhex{reinterpret_cast<uint32_t>(&begin_bss)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_bss)}, '\n');
}
} // extern "C"
/* boot.S externs */
extern uint32_t kernel_pagedir;
extern uint32_t kernel_ptable0;
extern uint32_t VADDR_OFFSET;
/* vmm */
static_assert(sizeof(vmm::address) == 4);
static_assert(vmm::address(0xc03ff000) == 0xc03ff000);
static_assert(vmm::address(0xc03ff000).table_idx == 768);
static_assert(vmm::address(0xc03ff000).page_idx == 1023);
static_assert(vmm::address(0xc03ff000).offset == 0);
vmm::vmm(uint32_t* addr) : directory{(addr == nullptr) ? &kernel_pagedir : addr} {}
Result<uint32_t, vmm::Error> vmm::map(uint32_t addr, const vmm::address dest) {
const auto phys_offset = addr % 4096;
const auto phys_paddr = addr & 0xfffff000;
// TODO allocate page table
if (directory[dest.table_idx] == 0) return Result<uint32_t, vmm::Error>{vmm::TableNotAllocated};
page_table table{directory[dest.table_idx]};
if (table.set(dest.page_idx, phys_paddr)) {
vmm::reload();
return Result<uint32_t, vmm::Error>{dest + phys_offset};
} else
return Result<uint32_t, vmm::Error>{vmm::AddressAlreadyMapped};
}
void vmm::unmap(const address d) {
if (directory[d.table_idx] == 0) return;
page_table table{directory[d.table_idx]};
table.set(d.page_idx, 0);
vmm::reload();
}
vmm::page_table::page_table(uint32_t from) {
// TODO get flags
// convert physical address to a virtual address so we can read it
from &= 0xfffff000; // discard flags
from += reinterpret_cast<uint32_t>(&VADDR_OFFSET);
pages = reinterpret_cast<uint32_t*>(from);
}
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