mirror of
https://github.com/taigrr/gopher-os
synced 2025-01-18 04:43:13 -08:00
Move multiboot package under the hal package
This commit is contained in:
Achilleas Anagnostopoulos
0
kernel/hal/hal.go
Normal file
0
kernel/hal/hal.go
Normal file
192
kernel/hal/multiboot/multiboot.go
Normal file
192
kernel/hal/multiboot/multiboot.go
Normal file
@@ -0,0 +1,192 @@
|
||||
package multiboot
|
||||
|
||||
import "unsafe"
|
||||
|
||||
type tagType uint32
|
||||
|
||||
const (
|
||||
tagMbSectionEnd tagType = iota
|
||||
tagBootCmdLine
|
||||
tagBootLoaderName
|
||||
tagModules
|
||||
tagBasicMemoryInfo
|
||||
tagBiosBootDevice
|
||||
tagMemoryMap
|
||||
tagVbeInfo
|
||||
tagFramebufferInfo
|
||||
tagElfSymbols
|
||||
tagApmTable
|
||||
)
|
||||
|
||||
// info describes the multiboot info section header.
|
||||
type info struct {
|
||||
// Total size of multiboot info section.
|
||||
totalSize uint32
|
||||
|
||||
// Always set to zero; reserved for future use
|
||||
reserved uint32
|
||||
}
|
||||
|
||||
// tagHeader describes the header the preceedes each tag.
|
||||
type tagHeader struct {
|
||||
// The type of the tag
|
||||
tagType tagType
|
||||
|
||||
// The size of the tag including the header but *not* including any
|
||||
// padding. According to the spec, each tag starts at a 8-byte aligned
|
||||
// address.
|
||||
size uint32
|
||||
}
|
||||
|
||||
// mmapHeader describes the header for a memory map specification.
|
||||
type mmapHeader struct {
|
||||
// The size of each entry.
|
||||
entrySize uint32
|
||||
|
||||
// The version of the entries that follow.
|
||||
entryVersion uint32
|
||||
}
|
||||
|
||||
// FramebufferType defines the type of the initialized framebuffer.
|
||||
type FramebufferType uint8
|
||||
|
||||
const (
|
||||
// FrameBufferTypeIndexed specifies a 256-color palette.
|
||||
FrameBufferTypeIndexed FramebufferType = iota
|
||||
|
||||
// FramebufferTypeRGB specifies direct RGB mode.
|
||||
FramebufferTypeRGB
|
||||
|
||||
// FramebufferTypeEGA specifies EGA text mode.
|
||||
FramebufferTypeEGA
|
||||
)
|
||||
|
||||
// FramebufferInfo provides information about the initialized framebuffer.
|
||||
type FramebufferInfo struct {
|
||||
// The framebuffer physical address.
|
||||
PhysAddr uint64
|
||||
|
||||
// Row pitch in bytes.
|
||||
Pitch uint32
|
||||
|
||||
// Width and height in pixels (or characters if Type = FramebufferTypeEGA)
|
||||
Width, Height uint32
|
||||
|
||||
// Bits per pixel (non EGA modes only).
|
||||
Bpp uint8
|
||||
|
||||
// Framebuffer type.
|
||||
Type FramebufferType
|
||||
}
|
||||
|
||||
// MemoryEntryType defines the type of a MemoryMapEntry.
|
||||
type MemoryEntryType uint32
|
||||
|
||||
const (
|
||||
// MemAvailable indicates that the memory region is available for use.
|
||||
MemAvailable MemoryEntryType = iota + 1
|
||||
|
||||
// MemReserved indicates that the memory region is not available for use.
|
||||
MemReserved
|
||||
|
||||
// MemAcpiReclaimable indicates a memory region that holds ACPI info that
|
||||
// can be reused by the OS.
|
||||
MemAcpiReclaimable
|
||||
|
||||
// MemNvs indicates memory that must be preserved when hibernating.
|
||||
MemNvs
|
||||
|
||||
// Any value >= memUnknown will be mapped to MemReserved.
|
||||
memUnknown
|
||||
)
|
||||
|
||||
/// MemoryMapEntry describes a memory region entry, namely its physical address,
|
||||
// its length and its type.
|
||||
type MemoryMapEntry struct {
|
||||
// The physical address for this memory region.
|
||||
PhysAddress uint64
|
||||
|
||||
// The length of the memory region.
|
||||
Length uint64
|
||||
|
||||
// The type of this entry.
|
||||
Type MemoryEntryType
|
||||
}
|
||||
|
||||
var (
|
||||
infoData uintptr
|
||||
)
|
||||
|
||||
// MemRegionVisitor defies a visitor function that gets invoked by VisitMemRegions
|
||||
// for each memory region provided by the boot loader.
|
||||
type MemRegionVisitor func(entry *MemoryMapEntry)
|
||||
|
||||
// SetInfoPtr updates the internal multiboot information pointer to the given
|
||||
// value. This function must be invoked before invoking any other function
|
||||
// exported by this package.
|
||||
func SetInfoPtr(ptr uintptr) {
|
||||
infoData = ptr
|
||||
}
|
||||
|
||||
// VisitMemRegions will invoke the supplied visitor for each memory region that
|
||||
// is defined by the multiboot info data that we received from the bootloader.
|
||||
func VisitMemRegions(visitor MemRegionVisitor) {
|
||||
curPtr, size := findTagByType(tagMemoryMap)
|
||||
if size == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
// curPtr points to the memory map header (2 dwords long)
|
||||
ptrMapHeader := (*mmapHeader)(unsafe.Pointer(curPtr))
|
||||
endPtr := curPtr + uintptr(size)
|
||||
curPtr += 8
|
||||
|
||||
var entry *MemoryMapEntry
|
||||
for curPtr != endPtr {
|
||||
entry = (*MemoryMapEntry)(unsafe.Pointer(curPtr))
|
||||
|
||||
// Mark unknown entry types as reserved
|
||||
if entry.Type == 0 || entry.Type > memUnknown {
|
||||
entry.Type = MemReserved
|
||||
}
|
||||
|
||||
visitor(entry)
|
||||
|
||||
curPtr += uintptr(ptrMapHeader.entrySize)
|
||||
}
|
||||
}
|
||||
|
||||
// GetFramebufferInfo returns information about the framebuffer initialized by the
|
||||
// bootloader. This function returns nil if no framebuffer info is available.
|
||||
func GetFramebufferInfo() *FramebufferInfo {
|
||||
var info *FramebufferInfo
|
||||
|
||||
curPtr, size := findTagByType(tagFramebufferInfo)
|
||||
if size != 0 {
|
||||
info = (*FramebufferInfo)(unsafe.Pointer(curPtr))
|
||||
}
|
||||
|
||||
return info
|
||||
}
|
||||
|
||||
// findTagByType scans the multiboot info data looking for the start of of the
|
||||
// specified type. It returns a pointer to the tag contents start offset and
|
||||
// the content length exluding the tag header.
|
||||
//
|
||||
// If the tag is not present in the multiboot info, findTagSection will return
|
||||
// back (0,0).
|
||||
func findTagByType(tagType tagType) (uintptr, uint32) {
|
||||
var ptrTagHeader *tagHeader
|
||||
|
||||
curPtr := infoData + 8
|
||||
for ptrTagHeader = (*tagHeader)(unsafe.Pointer(curPtr)); ptrTagHeader.tagType != tagMbSectionEnd; ptrTagHeader = (*tagHeader)(unsafe.Pointer(curPtr)) {
|
||||
if ptrTagHeader.tagType == tagType {
|
||||
return curPtr + 8, ptrTagHeader.size - 8
|
||||
}
|
||||
|
||||
// Tags are aligned at 8-byte aligned addresses
|
||||
curPtr += uintptr(int32(ptrTagHeader.size+7) & ^7)
|
||||
}
|
||||
|
||||
return 0, 0
|
||||
}
|
||||
215
kernel/hal/multiboot/multiboot_test.go
Normal file
215
kernel/hal/multiboot/multiboot_test.go
Normal file
@@ -0,0 +1,215 @@
|
||||
package multiboot
|
||||
|
||||
import (
|
||||
"testing"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
func TestFindTagByType(t *testing.T) {
|
||||
specs := []struct {
|
||||
tagType tagType
|
||||
expSize uint32
|
||||
}{
|
||||
{tagBootCmdLine, 1},
|
||||
{tagBootLoaderName, 27},
|
||||
{tagBasicMemoryInfo, 8},
|
||||
{tagBiosBootDevice, 12},
|
||||
{tagMemoryMap, 152},
|
||||
{tagFramebufferInfo, 24},
|
||||
{tagElfSymbols, 972},
|
||||
{tagApmTable, 20},
|
||||
}
|
||||
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&multibootInfoTestData[0])))
|
||||
|
||||
for specIndex, spec := range specs {
|
||||
_, size := findTagByType(spec.tagType)
|
||||
|
||||
if size != spec.expSize {
|
||||
t.Errorf("[spec %d] expected tag size for tag type %d to be %d; got %d", specIndex, spec.tagType, spec.expSize, size)
|
||||
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestFindTagByTypeWithMissingTag(t *testing.T) {
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&multibootInfoTestData[0])))
|
||||
|
||||
if offset, size := findTagByType(tagModules); offset != 0 || size != 0 {
|
||||
t.Fatalf("expected findTagByType to return (0,0) for missing tag; got (%d, %d)", offset, size)
|
||||
}
|
||||
}
|
||||
|
||||
func TestVisitMemRegion(t *testing.T) {
|
||||
specs := []struct {
|
||||
expPhys uint64
|
||||
expLen uint64
|
||||
expType MemoryEntryType
|
||||
}{
|
||||
// This region type is actually MemAvailable but we patch it to
|
||||
// a bogus value to test whether it gets flagged as reserved
|
||||
{0, 654336, MemReserved},
|
||||
{654336, 1024, MemReserved},
|
||||
{983040, 65536, MemReserved},
|
||||
{1048576, 133038080, MemAvailable},
|
||||
{134086656, 131072, MemReserved},
|
||||
{4294705152, 262144, MemReserved},
|
||||
}
|
||||
|
||||
var visitCount int
|
||||
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&emptyInfoData[0])))
|
||||
VisitMemRegions(func(_ *MemoryMapEntry) {
|
||||
visitCount++
|
||||
})
|
||||
|
||||
if visitCount != 0 {
|
||||
t.Fatal("expected visitor not to be invoked when no memory map tag is present")
|
||||
}
|
||||
|
||||
// Set a bogus type for the first entry in the map
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&multibootInfoTestData[0])))
|
||||
multibootInfoTestData[128] = 0xFF
|
||||
|
||||
VisitMemRegions(func(entry *MemoryMapEntry) {
|
||||
if entry.PhysAddress != specs[visitCount].expPhys {
|
||||
t.Errorf("[visit %d] expected physical address to be %x; got %x", visitCount, specs[visitCount].expPhys, entry.PhysAddress)
|
||||
}
|
||||
if entry.Length != specs[visitCount].expLen {
|
||||
t.Errorf("[visit %d] expected region len to be %x; got %x", visitCount, specs[visitCount].expLen, entry.Length)
|
||||
}
|
||||
if entry.Type != specs[visitCount].expType {
|
||||
t.Errorf("[visit %d] expected region type to be %d; got %d", visitCount, specs[visitCount].expType, entry.Type)
|
||||
}
|
||||
visitCount++
|
||||
})
|
||||
|
||||
if visitCount != len(specs) {
|
||||
t.Errorf("expected the visitor func to be invoked %d times; got %d", len(specs), visitCount)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGetFramebufferInfo(t *testing.T) {
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&emptyInfoData[0])))
|
||||
|
||||
if GetFramebufferInfo() != nil {
|
||||
t.Fatalf("expected GetFramebufferInfo() to return nil when no framebuffer tag is present")
|
||||
}
|
||||
|
||||
SetInfoPtr(uintptr(unsafe.Pointer(&multibootInfoTestData[0])))
|
||||
fbInfo := GetFramebufferInfo()
|
||||
|
||||
if fbInfo.Type != FramebufferTypeEGA {
|
||||
t.Errorf("expected framebuffer type to be %d; got %d", FramebufferTypeEGA, fbInfo.Type)
|
||||
}
|
||||
|
||||
if fbInfo.PhysAddr != 0xB8000 {
|
||||
t.Errorf("expected physical address for EGA text mode to be 0xB8000; got %x", fbInfo.PhysAddr)
|
||||
}
|
||||
|
||||
if fbInfo.Width != 80 || fbInfo.Height != 25 {
|
||||
t.Errorf("expected framebuffer dimensions to be 80x25; got %dx%d", fbInfo.Width, fbInfo.Height)
|
||||
}
|
||||
|
||||
if fbInfo.Pitch != 160 {
|
||||
t.Errorf("expected pitch to be 160; got %x", fbInfo.Pitch)
|
||||
}
|
||||
}
|
||||
|
||||
var (
|
||||
emptyInfoData = []byte{
|
||||
0, 0, 0, 0, // size
|
||||
0, 0, 0, 0, // reserved
|
||||
0, 0, 0, 0, // tag with type zero and length zero
|
||||
0, 0, 0, 0,
|
||||
}
|
||||
|
||||
// A dump of multiboot data when running under qemu.
|
||||
multibootInfoTestData = []byte{
|
||||
72, 5, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 9, 0, 0, 0,
|
||||
0, 171, 253, 7, 118, 119, 123, 0, 2, 0, 0, 0, 35, 0, 0, 0,
|
||||
71, 82, 85, 66, 32, 50, 46, 48, 50, 126, 98, 101, 116, 97, 50, 45,
|
||||
57, 117, 98, 117, 110, 116, 117, 49, 46, 54, 0, 0, 0, 0, 0, 0,
|
||||
10, 0, 0, 0, 28, 0, 0, 0, 2, 1, 0, 240, 4, 213, 0, 0,
|
||||
0, 240, 0, 240, 3, 0, 240, 255, 240, 255, 240, 255, 0, 0, 0, 0,
|
||||
6, 0, 0, 0, 160, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 252, 9, 0, 0, 0, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 0, 0, 252, 9, 0, 0, 0, 0, 0,
|
||||
0, 4, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 15, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
|
||||
2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0,
|
||||
0, 0, 238, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 254, 7, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0,
|
||||
2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 252, 255, 0, 0, 0, 0,
|
||||
0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
|
||||
9, 0, 0, 0, 212, 3, 0, 0, 24, 0, 0, 0, 40, 0, 0, 0,
|
||||
21, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 27, 0, 0, 0,
|
||||
1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 16, 0, 0, 16, 0, 0,
|
||||
24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0,
|
||||
0, 0, 0, 0, 38, 0, 0, 0, 1, 0, 0, 0, 6, 0, 0, 0,
|
||||
0, 16, 16, 0, 0, 32, 0, 0, 135, 26, 4, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 44, 0, 0, 0,
|
||||
1, 0, 0, 0, 2, 0, 0, 0, 0, 48, 20, 0, 0, 64, 4, 0,
|
||||
194, 167, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0,
|
||||
0, 0, 0, 0, 52, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0,
|
||||
224, 215, 21, 0, 224, 231, 5, 0, 176, 6, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0,
|
||||
1, 0, 0, 0, 2, 0, 0, 0, 144, 222, 21, 0, 144, 238, 5, 0,
|
||||
4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0,
|
||||
0, 0, 0, 0, 72, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0,
|
||||
160, 222, 21, 0, 160, 238, 5, 0, 119, 23, 2, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 83, 0, 0, 0,
|
||||
7, 0, 0, 0, 2, 0, 0, 0, 32, 246, 23, 0, 32, 6, 8, 0,
|
||||
56, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 0,
|
||||
0, 0, 0, 0, 100, 0, 0, 0, 1, 0, 0, 0, 3, 0, 0, 0,
|
||||
0, 0, 24, 0, 0, 16, 8, 0, 204, 5, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 106, 0, 0, 0,
|
||||
1, 0, 0, 0, 3, 0, 0, 0, 224, 5, 24, 0, 224, 21, 8, 0,
|
||||
178, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 0,
|
||||
0, 0, 0, 0, 117, 0, 0, 0, 8, 0, 0, 0, 3, 4, 0, 0,
|
||||
148, 15, 24, 0, 146, 31, 8, 0, 4, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 123, 0, 0, 0,
|
||||
8, 0, 0, 0, 3, 0, 0, 0, 0, 16, 24, 0, 146, 31, 8, 0,
|
||||
176, 61, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0,
|
||||
0, 0, 0, 0, 128, 0, 0, 0, 8, 0, 0, 0, 3, 0, 0, 0,
|
||||
192, 77, 25, 0, 146, 31, 8, 0, 32, 56, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 138, 0, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 0, 224, 133, 25, 0, 146, 31, 8, 0,
|
||||
64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 153, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
32, 134, 25, 0, 210, 31, 8, 0, 129, 26, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 169, 0, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 0, 161, 160, 25, 0, 83, 58, 8, 0,
|
||||
2, 201, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 181, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
163, 105, 27, 0, 85, 3, 10, 0, 25, 1, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 195, 0, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 0, 188, 106, 27, 0, 110, 4, 10, 0,
|
||||
67, 153, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 207, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 4, 28, 0, 184, 157, 10, 0, 252, 112, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 220, 0, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 0, 252, 116, 28, 0, 180, 14, 11, 0,
|
||||
16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 231, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
12, 117, 28, 0, 196, 14, 11, 0, 239, 79, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 17, 0, 0, 0,
|
||||
3, 0, 0, 0, 0, 0, 0, 0, 251, 196, 28, 0, 179, 94, 11, 0,
|
||||
247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
|
||||
244, 197, 28, 0, 108, 99, 11, 0, 80, 77, 0, 0, 23, 0, 0, 0,
|
||||
210, 4, 0, 0, 4, 0, 0, 0, 16, 0, 0, 0, 9, 0, 0, 0,
|
||||
3, 0, 0, 0, 0, 0, 0, 0, 68, 19, 29, 0, 188, 176, 11, 0,
|
||||
107, 104, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 16, 0, 0, 0,
|
||||
127, 2, 0, 0, 128, 251, 1, 0, 5, 0, 0, 0, 20, 0, 0, 0,
|
||||
224, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0,
|
||||
8, 0, 0, 0, 32, 0, 0, 0, 0, 128, 11, 0, 0, 0, 0, 0,
|
||||
160, 0, 0, 0, 80, 0, 0, 0, 25, 0, 0, 0, 16, 2, 0, 0,
|
||||
14, 0, 0, 0, 28, 0, 0, 0, 82, 83, 68, 32, 80, 84, 82, 32,
|
||||
89, 66, 79, 67, 72, 83, 32, 0, 220, 24, 254, 7, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 8, 0, 0, 0,
|
||||
}
|
||||
)
|
||||
Reference in New Issue
Block a user