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-rwxr-xr-xtools/gen-device-svd/gen-device-svd.go971
1 files changed, 971 insertions, 0 deletions
diff --git a/tools/gen-device-svd/gen-device-svd.go b/tools/gen-device-svd/gen-device-svd.go
new file mode 100755
index 000000000..2a3d03910
--- /dev/null
+++ b/tools/gen-device-svd/gen-device-svd.go
@@ -0,0 +1,971 @@
+package main
+
+import (
+ "bufio"
+ "encoding/xml"
+ "flag"
+ "fmt"
+ "os"
+ "path/filepath"
+ "regexp"
+ "sort"
+ "strconv"
+ "strings"
+ "text/template"
+ "unicode"
+)
+
+var validName = regexp.MustCompile("^[a-zA-Z0-9_]+$")
+
+type SVDFile struct {
+ XMLName xml.Name `xml:"device"`
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ LicenseText string `xml:"licenseText"`
+ Peripherals []struct {
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ BaseAddress string `xml:"baseAddress"`
+ GroupName string `xml:"groupName"`
+ DerivedFrom string `xml:"derivedFrom,attr"`
+ Interrupts []struct {
+ Name string `xml:"name"`
+ Index int `xml:"value"`
+ } `xml:"interrupt"`
+ Registers []*SVDRegister `xml:"registers>register"`
+ Clusters []*SVDCluster `xml:"registers>cluster"`
+ } `xml:"peripherals>peripheral"`
+}
+
+type SVDRegister struct {
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ Dim *string `xml:"dim"`
+ DimIncrement string `xml:"dimIncrement"`
+ Size *string `xml:"size"`
+ Fields []*SVDField `xml:"fields>field"`
+ Offset *string `xml:"offset"`
+ AddressOffset *string `xml:"addressOffset"`
+}
+
+type SVDField struct {
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ Lsb *uint32 `xml:"lsb"`
+ Msb *uint32 `xml:"msb"`
+ BitOffset *uint32 `xml:"bitOffset"`
+ BitWidth *uint32 `xml:"bitWidth"`
+ BitRange *string `xml:"bitRange"`
+ EnumeratedValues []struct {
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ Value string `xml:"value"`
+ } `xml:"enumeratedValues>enumeratedValue"`
+}
+
+type SVDCluster struct {
+ Dim *int `xml:"dim"`
+ DimIncrement string `xml:"dimIncrement"`
+ DimIndex *string `xml:"dimIndex"`
+ Name string `xml:"name"`
+ Description string `xml:"description"`
+ Registers []*SVDRegister `xml:"register"`
+ Clusters []*SVDCluster `xml:"cluster"`
+ AddressOffset string `xml:"addressOffset"`
+}
+
+type Device struct {
+ metadata map[string]string
+ interrupts []*interrupt
+ peripherals []*peripheral
+}
+
+type interrupt struct {
+ Name string
+ peripheralIndex int
+ Value int // interrupt number
+ Description string
+}
+
+type peripheral struct {
+ Name string
+ GroupName string
+ BaseAddress uint64
+ Description string
+ ClusterName string
+ registers []*PeripheralField
+ subtypes []*peripheral
+}
+
+// A PeripheralField is a single field in a peripheral type. It may be a full
+// peripheral or a cluster within a peripheral.
+type PeripheralField struct {
+ name string
+ address uint64
+ description string
+ registers []*PeripheralField // contains fields if this is a cluster
+ array int
+ elementSize int
+ bitfields []Bitfield
+}
+
+type Bitfield struct {
+ name string
+ description string
+ value uint32
+}
+
+func formatText(text string) string {
+ text = regexp.MustCompile(`[ \t\n]+`).ReplaceAllString(text, " ") // Collapse whitespace (like in HTML)
+ text = strings.Replace(text, "\\n ", "\n", -1)
+ text = strings.TrimSpace(text)
+ return text
+}
+
+// Replace characters that are not allowed in a symbol name with a '_'. This is
+// useful to be able to process SVD files with errors.
+func cleanName(text string) string {
+ if !validName.MatchString(text) {
+ result := make([]rune, 0, len(text))
+ for _, c := range text {
+ if validName.MatchString(string(c)) {
+ result = append(result, c)
+ } else {
+ result = append(result, '_')
+ }
+ }
+ text = string(result)
+ }
+ return text
+}
+
+// Read ARM SVD files.
+func readSVD(path, sourceURL string) (*Device, error) {
+ // Open the XML file.
+ f, err := os.Open(path)
+ if err != nil {
+ return nil, err
+ }
+ defer f.Close()
+ decoder := xml.NewDecoder(f)
+ device := &SVDFile{}
+ err = decoder.Decode(device)
+ if err != nil {
+ return nil, err
+ }
+
+ peripheralDict := map[string]*peripheral{}
+ groups := map[string]*peripheral{}
+
+ interrupts := make(map[string]*interrupt)
+ var peripheralsList []*peripheral
+
+ for _, periphEl := range device.Peripherals {
+ description := formatText(periphEl.Description)
+ baseAddress, err := strconv.ParseUint(periphEl.BaseAddress, 0, 32)
+ if err != nil {
+ return nil, fmt.Errorf("invalid base address: %w", err)
+ }
+ // Some group names (for example the STM32H7A3x) have an invalid
+ // group name. Replace invalid characters with "_".
+ groupName := cleanName(periphEl.GroupName)
+
+ for _, interrupt := range periphEl.Interrupts {
+ addInterrupt(interrupts, interrupt.Name, interrupt.Index, description)
+ // As a convenience, also use the peripheral name as the interrupt
+ // name. Only do that for the nrf for now, as the stm32 .svd files
+ // don't always put interrupts in the correct peripheral...
+ if len(periphEl.Interrupts) == 1 && strings.HasPrefix(device.Name, "nrf") {
+ addInterrupt(interrupts, periphEl.Name, interrupt.Index, description)
+ }
+ }
+
+ if _, ok := groups[groupName]; ok || periphEl.DerivedFrom != "" {
+ var derivedFrom *peripheral
+ if periphEl.DerivedFrom != "" {
+ derivedFrom = peripheralDict[periphEl.DerivedFrom]
+ } else {
+ derivedFrom = groups[groupName]
+ }
+ p := &peripheral{
+ Name: periphEl.Name,
+ GroupName: derivedFrom.GroupName,
+ Description: description,
+ BaseAddress: baseAddress,
+ }
+ if p.Description == "" {
+ p.Description = derivedFrom.Description
+ }
+ peripheralsList = append(peripheralsList, p)
+ peripheralDict[p.Name] = p
+ for _, subtype := range derivedFrom.subtypes {
+ peripheralsList = append(peripheralsList, &peripheral{
+ Name: periphEl.Name + "_" + subtype.ClusterName,
+ GroupName: subtype.GroupName,
+ Description: subtype.Description,
+ BaseAddress: baseAddress,
+ })
+ }
+ continue
+ }
+
+ p := &peripheral{
+ Name: periphEl.Name,
+ GroupName: groupName,
+ Description: description,
+ BaseAddress: baseAddress,
+ registers: []*PeripheralField{},
+ }
+ if p.GroupName == "" {
+ p.GroupName = periphEl.Name
+ }
+ peripheralsList = append(peripheralsList, p)
+ peripheralDict[periphEl.Name] = p
+
+ if _, ok := groups[groupName]; !ok && groupName != "" {
+ groups[groupName] = p
+ }
+
+ for _, register := range periphEl.Registers {
+ regName := groupName // preferably use the group name
+ if regName == "" {
+ regName = periphEl.Name // fall back to peripheral name
+ }
+ p.registers = append(p.registers, parseRegister(regName, register, baseAddress, "")...)
+ }
+ for _, cluster := range periphEl.Clusters {
+ clusterName := strings.Replace(cluster.Name, "[%s]", "", -1)
+ if cluster.DimIndex != nil {
+ clusterName = strings.Replace(clusterName, "%s", "", -1)
+ }
+ clusterPrefix := clusterName + "_"
+ clusterOffset, err := strconv.ParseUint(cluster.AddressOffset, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ var dim, dimIncrement int
+ if cluster.Dim == nil {
+ if clusterOffset == 0 {
+ // make this a separate peripheral
+ cpRegisters := []*PeripheralField{}
+ for _, regEl := range cluster.Registers {
+ cpRegisters = append(cpRegisters, parseRegister(groupName, regEl, baseAddress, clusterName+"_")...)
+ }
+ // handle sub-clusters of registers
+ for _, subClusterEl := range cluster.Clusters {
+ subclusterName := strings.Replace(subClusterEl.Name, "[%s]", "", -1)
+ subclusterPrefix := subclusterName + "_"
+ subclusterOffset, err := strconv.ParseUint(subClusterEl.AddressOffset, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ subdim := *subClusterEl.Dim
+ subdimIncrement, err := strconv.ParseInt(subClusterEl.DimIncrement, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+
+ if subdim > 1 {
+ subcpRegisters := []*PeripheralField{}
+ subregSize := 0
+ for _, regEl := range subClusterEl.Registers {
+ size, err := strconv.ParseInt(*regEl.Size, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ subregSize += int(size)
+ subcpRegisters = append(subcpRegisters, parseRegister(groupName, regEl, baseAddress+subclusterOffset, subclusterPrefix)...)
+ }
+ cpRegisters = append(cpRegisters, &PeripheralField{
+ name: subclusterName,
+ address: baseAddress + subclusterOffset,
+ description: subClusterEl.Description,
+ registers: subcpRegisters,
+ array: subdim,
+ elementSize: int(subdimIncrement),
+ })
+ } else {
+ for _, regEl := range subClusterEl.Registers {
+ cpRegisters = append(cpRegisters, parseRegister(regEl.Name, regEl, baseAddress+subclusterOffset, subclusterPrefix)...)
+ }
+ }
+ }
+
+ sort.SliceStable(cpRegisters, func(i, j int) bool {
+ return cpRegisters[i].address < cpRegisters[j].address
+ })
+ clusterPeripheral := &peripheral{
+ Name: periphEl.Name + "_" + clusterName,
+ GroupName: groupName + "_" + clusterName,
+ Description: description + " - " + clusterName,
+ ClusterName: clusterName,
+ BaseAddress: baseAddress,
+ registers: cpRegisters,
+ }
+ peripheralsList = append(peripheralsList, clusterPeripheral)
+ peripheralDict[clusterPeripheral.Name] = clusterPeripheral
+ p.subtypes = append(p.subtypes, clusterPeripheral)
+ continue
+ }
+ dim = -1
+ dimIncrement = -1
+ } else {
+ dim = *cluster.Dim
+ if dim == 1 {
+ dimIncrement = -1
+ } else {
+ inc, err := strconv.ParseUint(cluster.DimIncrement, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ dimIncrement = int(inc)
+ }
+ }
+ clusterRegisters := []*PeripheralField{}
+ for _, regEl := range cluster.Registers {
+ regName := groupName
+ if regName == "" {
+ regName = periphEl.Name
+ }
+ clusterRegisters = append(clusterRegisters, parseRegister(regName, regEl, baseAddress+clusterOffset, clusterPrefix)...)
+ }
+ sort.SliceStable(clusterRegisters, func(i, j int) bool {
+ return clusterRegisters[i].address < clusterRegisters[j].address
+ })
+ if dimIncrement == -1 {
+ lastReg := clusterRegisters[len(clusterRegisters)-1]
+ lastAddress := lastReg.address
+ if lastReg.array != -1 {
+ lastAddress = lastReg.address + uint64(lastReg.array*lastReg.elementSize)
+ }
+ firstAddress := clusterRegisters[0].address
+ dimIncrement = int(lastAddress - firstAddress)
+ }
+ p.registers = append(p.registers, &PeripheralField{
+ name: clusterName,
+ address: baseAddress + clusterOffset,
+ description: cluster.Description,
+ registers: clusterRegisters,
+ array: dim,
+ elementSize: dimIncrement,
+ })
+ }
+ sort.SliceStable(p.registers, func(i, j int) bool {
+ return p.registers[i].address < p.registers[j].address
+ })
+ }
+
+ // Make a sorted list of interrupts.
+ interruptList := make([]*interrupt, 0, len(interrupts))
+ for _, intr := range interrupts {
+ interruptList = append(interruptList, intr)
+ }
+ sort.SliceStable(interruptList, func(i, j int) bool {
+ if interruptList[i].Value != interruptList[j].Value {
+ return interruptList[i].Value < interruptList[j].Value
+ }
+ return interruptList[i].peripheralIndex < interruptList[j].peripheralIndex
+ })
+
+ // Properly format the license block, with comments.
+ licenseBlock := ""
+ if text := formatText(device.LicenseText); text != "" {
+ licenseBlock = "// " + strings.Replace(text, "\n", "\n// ", -1)
+ licenseBlock = regexp.MustCompile(`\s+\n`).ReplaceAllString(licenseBlock, "\n")
+ }
+
+ return &Device{
+ metadata: map[string]string{
+ "file": filepath.Base(path),
+ "descriptorSource": sourceURL,
+ "name": device.Name,
+ "nameLower": strings.ToLower(device.Name),
+ "description": strings.TrimSpace(device.Description),
+ "licenseBlock": licenseBlock,
+ },
+ interrupts: interruptList,
+ peripherals: peripheralsList,
+ }, nil
+}
+
+func addInterrupt(interrupts map[string]*interrupt, name string, index int, description string) {
+ if _, ok := interrupts[name]; ok {
+ if interrupts[name].Value != index {
+ // Note: some SVD files like the one for STM32H7x7 contain mistakes.
+ // Instead of throwing an error, simply log it.
+ fmt.Fprintf(os.Stderr, "interrupt with the same name has different indexes: %s (%d vs %d)",
+ name, interrupts[name].Value, index)
+ }
+ parts := strings.Split(interrupts[name].Description, " // ")
+ hasDescription := false
+ for _, part := range parts {
+ if part == description {
+ hasDescription = true
+ }
+ }
+ if !hasDescription {
+ interrupts[name].Description += " // " + description
+ }
+ } else {
+ interrupts[name] = &interrupt{
+ Name: name,
+ peripheralIndex: len(interrupts),
+ Value: index,
+ Description: description,
+ }
+ }
+}
+
+func parseBitfields(groupName, regName string, fieldEls []*SVDField, bitfieldPrefix string) []Bitfield {
+ var fields []Bitfield
+ for _, fieldEl := range fieldEls {
+ // Some bitfields (like the STM32H7x7) contain invalid bitfield
+ // names like "CNT[31]". Replace invalid characters with "_" when
+ // needed.
+ fieldName := cleanName(fieldEl.Name)
+ if !unicode.IsUpper(rune(fieldName[0])) && !unicode.IsDigit(rune(fieldName[0])) {
+ fieldName = strings.ToUpper(fieldName)
+ }
+
+ // Find the lsb/msb that is encoded in various ways.
+ // Standards are great, that's why there are so many to choose from!
+ var lsb, msb uint32
+ if fieldEl.Lsb != nil && fieldEl.Msb != nil {
+ // try to use lsb/msb tags
+ lsb = *fieldEl.Lsb
+ msb = *fieldEl.Msb
+ } else if fieldEl.BitOffset != nil && fieldEl.BitWidth != nil {
+ // try to use bitOffset/bitWidth tags
+ lsb = *fieldEl.BitOffset
+ msb = *fieldEl.BitWidth + lsb - 1
+ } else if fieldEl.BitRange != nil {
+ // try use bitRange
+ // example string: "[20:16]"
+ parts := strings.Split(strings.Trim(*fieldEl.BitRange, "[]"), ":")
+ l, err := strconv.ParseUint(parts[1], 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ lsb = uint32(l)
+ m, err := strconv.ParseUint(parts[0], 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ msb = uint32(m)
+ } else {
+ // this is an error. what to do?
+ fmt.Fprintln(os.Stderr, "unable to find lsb/msb in field:", fieldName)
+ continue
+ }
+
+ fields = append(fields, Bitfield{
+ name: fmt.Sprintf("%s_%s%s_%s_Pos", groupName, bitfieldPrefix, regName, fieldName),
+ description: fmt.Sprintf("Position of %s field.", fieldName),
+ value: lsb,
+ })
+ fields = append(fields, Bitfield{
+ name: fmt.Sprintf("%s_%s%s_%s_Msk", groupName, bitfieldPrefix, regName, fieldName),
+ description: fmt.Sprintf("Bit mask of %s field.", fieldName),
+ value: (0xffffffff >> (31 - (msb - lsb))) << lsb,
+ })
+ if lsb == msb { // single bit
+ fields = append(fields, Bitfield{
+ name: fmt.Sprintf("%s_%s%s_%s", groupName, bitfieldPrefix, regName, fieldName),
+ description: fmt.Sprintf("Bit %s.", fieldName),
+ value: 1 << lsb,
+ })
+ }
+ for _, enumEl := range fieldEl.EnumeratedValues {
+ enumName := enumEl.Name
+ if !unicode.IsUpper(rune(enumName[0])) && !unicode.IsDigit(rune(enumName[0])) {
+ enumName = strings.ToUpper(enumName)
+ }
+ enumDescription := strings.Replace(enumEl.Description, "\n", " ", -1)
+ enumValue, err := strconv.ParseUint(enumEl.Value, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ fields = append(fields, Bitfield{
+ name: fmt.Sprintf("%s_%s%s_%s_%s", groupName, bitfieldPrefix, regName, fieldName, enumName),
+ description: enumDescription,
+ value: uint32(enumValue),
+ })
+ }
+ }
+ return fields
+}
+
+type Register struct {
+ element *SVDRegister
+ baseAddress uint64
+}
+
+func NewRegister(element *SVDRegister, baseAddress uint64) *Register {
+ return &Register{
+ element: element,
+ baseAddress: baseAddress,
+ }
+}
+
+func (r *Register) name() string {
+ return strings.Replace(r.element.Name, "[%s]", "", -1)
+}
+
+func (r *Register) description() string {
+ return strings.Replace(r.element.Description, "\n", " ", -1)
+}
+
+func (r *Register) address() uint64 {
+ offsetString := r.element.Offset
+ if offsetString == nil {
+ offsetString = r.element.AddressOffset
+ }
+ addr, err := strconv.ParseUint(*offsetString, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ return r.baseAddress + addr
+}
+
+func (r *Register) dim() int {
+ if r.element.Dim == nil {
+ return -1 // no dim elements
+ }
+ dim, err := strconv.ParseInt(*r.element.Dim, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ return int(dim)
+}
+
+func (r *Register) size() int {
+ if r.element.Size != nil {
+ size, err := strconv.ParseInt(*r.element.Size, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ return int(size) / 8
+ }
+ return 4
+}
+
+func parseRegister(groupName string, regEl *SVDRegister, baseAddress uint64, bitfieldPrefix string) []*PeripheralField {
+ reg := NewRegister(regEl, baseAddress)
+
+ if reg.dim() != -1 {
+ dimIncrement, err := strconv.ParseUint(regEl.DimIncrement, 0, 32)
+ if err != nil {
+ panic(err)
+ }
+ if strings.Contains(reg.name(), "%s") {
+ // a "spaced array" of registers, special processing required
+ // we need to generate a separate register for each "element"
+ var results []*PeripheralField
+ for i := uint64(0); i < uint64(reg.dim()); i++ {
+ regAddress := reg.address() + (i * dimIncrement)
+ results = append(results, &PeripheralField{
+ name: strings.Replace(reg.name(), "%s", strconv.FormatUint(i, 10), -1),
+ address: regAddress,
+ description: reg.description(),
+ array: -1,
+ elementSize: reg.size(),
+ })
+ }
+ // set first result bitfield
+ shortName := strings.ToUpper(strings.Replace(strings.Replace(reg.name(), "_%s", "", -1), "%s", "", -1))
+ results[0].bitfields = parseBitfields(groupName, shortName, regEl.Fields, bitfieldPrefix)
+ return results
+ }
+ }
+ regName := reg.name()
+ if !unicode.IsUpper(rune(regName[0])) && !unicode.IsDigit(rune(regName[0])) {
+ regName = strings.ToUpper(regName)
+ }
+
+ return []*PeripheralField{&PeripheralField{
+ name: regName,
+ address: reg.address(),
+ description: reg.description(),
+ bitfields: parseBitfields(groupName, regName, regEl.Fields, bitfieldPrefix),
+ array: reg.dim(),
+ elementSize: reg.size(),
+ }}
+}
+
+// The Go module for this device.
+func writeGo(outdir string, device *Device) error {
+ outf, err := os.Create(filepath.Join(outdir, device.metadata["nameLower"]+".go"))
+ if err != nil {
+ return err
+ }
+ defer outf.Close()
+ w := bufio.NewWriter(outf)
+
+ maxInterruptValue := 0
+ for _, intr := range device.interrupts {
+ if intr.Value > maxInterruptValue {
+ maxInterruptValue = intr.Value
+ }
+ }
+
+ t := template.Must(template.New("go").Parse(`// Automatically generated file. DO NOT EDIT.
+// Generated by gen-device-svd.go from {{.metadata.file}}, see {{.metadata.descriptorSource}}
+
+// +build {{.pkgName}},{{.metadata.nameLower}}
+
+// {{.metadata.description}}
+//
+{{.metadata.licenseBlock}}
+package {{.pkgName}}
+
+import (
+ "runtime/volatile"
+ "unsafe"
+)
+
+// Some information about this device.
+const (
+ DEVICE = "{{.metadata.name}}"
+)
+
+// Interrupt numbers
+const ({{range .interrupts}}
+ IRQ_{{.Name}} = {{.Value}} // {{.Description}}{{end}}
+ IRQ_max = {{.interruptMax}} // Highest interrupt number on this device.
+)
+
+// Peripherals.
+var (
+{{range .peripherals}} {{.Name}} = (*{{.GroupName}}_Type)(unsafe.Pointer(uintptr(0x{{printf "%x" .BaseAddress}}))) // {{.Description}}
+{{end}})
+`))
+ err = t.Execute(w, map[string]interface{}{
+ "metadata": device.metadata,
+ "interrupts": device.interrupts,
+ "peripherals": device.peripherals,
+ "pkgName": filepath.Base(strings.TrimRight(outdir, "/")),
+ "interruptMax": maxInterruptValue,
+ })
+ if err != nil {
+ return err
+ }
+
+ // Define peripheral struct types.
+ for _, peripheral := range device.peripherals {
+ if peripheral.registers == nil {
+ // This peripheral was derived from another peripheral. No new type
+ // needs to be defined for it.
+ continue
+ }
+ fmt.Fprintf(w, "\n// %s\ntype %s_Type struct {\n", peripheral.Description, peripheral.GroupName)
+ address := peripheral.BaseAddress
+ for _, register := range peripheral.registers {
+ if register.registers == nil && address > register.address {
+ // In Nordic SVD files, these registers are deprecated or
+ // duplicates, so can be ignored.
+ //fmt.Fprintf(os.Stderr, "skip: %s.%s 0x%x - 0x%x %d\n", peripheral.Name, register.name, address, register.address, register.elementSize)
+ continue
+ }
+
+ var regType string
+ eSize := register.elementSize
+ switch eSize {
+ case 4:
+ regType = "volatile.Register32"
+ case 2:
+ regType = "volatile.Register16"
+ case 1:
+ regType = "volatile.Register8"
+ default:
+ eSize = 4
+ regType = "volatile.Register32"
+ }
+
+ // insert padding, if needed
+ if address < register.address {
+ bytesNeeded := register.address - address
+ switch bytesNeeded {
+ case 1:
+ w.WriteString("\t_ volatile.Register8\n")
+ case 2:
+ w.WriteString("\t_ volatile.Register16\n")
+ case 3:
+ w.WriteString("\t_ [3]volatile.Register8\n")
+ default:
+ numSkip := (register.address - address) / uint64(eSize)
+ if numSkip == 1 {
+ fmt.Fprintf(w, "\t_ %s\n", regType)
+ } else {
+ fmt.Fprintf(w, "\t_ [%d]%s\n", numSkip, regType)
+ }
+ }
+ address = register.address
+ }
+
+ lastCluster := false
+ if register.registers != nil {
+ // This is a cluster, not a register. Create the cluster type.
+ regType = "struct {\n"
+ subaddress := register.address
+ var subregSize uint64
+ var subregType string
+ for _, subregister := range register.registers {
+ switch subregister.elementSize {
+ case 4:
+ subregType = "volatile.Register32"
+ case 2:
+ subregType = "volatile.Register16"
+ case 1:
+ subregType = "volatile.Register8"
+ }
+ if subregType == "" {
+ panic("unknown element size")
+ }
+
+ if subregister.array != -1 {
+ subregType = fmt.Sprintf("[%d]%s", subregister.array, subregType)
+ }
+ if subaddress != subregister.address {
+ bytesNeeded := subregister.address - subaddress
+ if bytesNeeded == 1 {
+ regType += "\t\t_ volatile.Register8\n"
+ } else if bytesNeeded == 2 {
+ regType += "\t\t_ volatile.Register16\n"
+ } else {
+ numSkip := (subregister.address - subaddress)
+ if numSkip < 1 {
+ continue
+ } else if numSkip == 1 {
+ regType += "\t\t_ volatile.Register8\n"
+ } else {
+ regType += fmt.Sprintf("\t\t_ [%d]volatile.Register8\n", numSkip)
+ }
+ }
+ subaddress += bytesNeeded
+ }
+ if subregister.array != -1 {
+ subregSize = uint64(subregister.array * subregister.elementSize)
+ } else {
+ subregSize = uint64(subregister.elementSize)
+ }
+ subaddress += subregSize
+ regType += fmt.Sprintf("\t\t%s %s\n", subregister.name, subregType)
+ }
+ if register.array != -1 {
+ if subaddress != register.address+uint64(register.elementSize) {
+ numSkip := ((register.address + uint64(register.elementSize)) - subaddress) / subregSize
+ if numSkip <= 1 {
+ regType += fmt.Sprintf("\t\t_ %s\n", subregType)
+ } else {
+ regType += fmt.Sprintf("\t\t_ [%d]%s\n", numSkip, subregType)
+ }
+ }
+ } else {
+ lastCluster = true
+ }
+ regType += "\t}"
+ address = subaddress
+ }
+
+ if register.array != -1 {
+ regType = fmt.Sprintf("[%d]%s", register.array, regType)
+ }
+ fmt.Fprintf(w, "\t%s %s\n", register.name, regType)
+
+ // next address
+ if lastCluster {
+ lastCluster = false
+ } else if register.array != -1 {
+ address = register.address + uint64(register.elementSize*register.array)
+ } else {
+ address = register.address + uint64(register.elementSize)
+ }
+ }
+ w.WriteString("}\n")
+ }
+
+ // Define bitfields.
+ for _, peripheral := range device.peripherals {
+ if peripheral.registers == nil {
+ // This peripheral was derived from another peripheral. Bitfields are
+ // already defined.
+ continue
+ }
+ fmt.Fprintf(w, "\n// Bitfields for %s: %s\nconst(", peripheral.Name, peripheral.Description)
+ for _, register := range peripheral.registers {
+ if len(register.bitfields) != 0 {
+ writeGoRegisterBitfields(w, register, register.name)
+ }
+ if register.registers == nil {
+ continue
+ }
+ for _, subregister := range register.registers {
+ writeGoRegisterBitfields(w, subregister, register.name+"."+subregister.name)
+ }
+ }
+ w.WriteString(")\n")
+ }
+
+ return w.Flush()
+}
+
+func writeGoRegisterBitfields(w *bufio.Writer, register *PeripheralField, name string) {
+ w.WriteString("\n\t// " + name)
+ if register.description != "" {
+ w.WriteString(": " + register.description)
+ }
+ w.WriteByte('\n')
+ for _, bitfield := range register.bitfields {
+ fmt.Fprintf(w, "\t%s = 0x%x", bitfield.name, bitfield.value)
+ if bitfield.description != "" {
+ w.WriteString(" // " + bitfield.description)
+ }
+ w.WriteByte('\n')
+ }
+}
+
+// The interrupt vector, which is hard to write directly in Go.
+func writeAsm(outdir string, device *Device) error {
+ outf, err := os.Create(filepath.Join(outdir, device.metadata["nameLower"]+".s"))
+ if err != nil {
+ return err
+ }
+ defer outf.Close()
+ w := bufio.NewWriter(outf)
+
+ t := template.Must(template.New("go").Parse(`// Automatically generated file. DO NOT EDIT.
+// Generated by gen-device-svd.go from {{.file}}, see {{.descriptorSource}}
+
+// {{.description}}
+//
+{{.licenseBlock}}
+
+.syntax unified
+
+// This is the default handler for interrupts, if triggered but not defined.
+.section .text.Default_Handler
+.global Default_Handler
+.type Default_Handler, %function
+Default_Handler:
+ wfe
+ b Default_Handler
+
+// Avoid the need for repeated .weak and .set instructions.
+.macro IRQ handler
+ .weak \handler
+ .set \handler, Default_Handler
+.endm
+
+// Must set the "a" flag on the section:
+// https://svnweb.freebsd.org/base/stable/11/sys/arm/arm/locore-v4.S?r1=321049&r2=321048&pathrev=321049
+// https://sourceware.org/binutils/docs/as/Section.html#ELF-Version
+.section .isr_vector, "a", %progbits
+.global __isr_vector
+ // Interrupt vector as defined by Cortex-M, starting with the stack top.
+ // On reset, SP is initialized with *0x0 and PC is loaded with *0x4, loading
+ // _stack_top and Reset_Handler.
+ .long _stack_top
+ .long Reset_Handler
+ .long NMI_Handler
+ .long HardFault_Handler
+ .long MemoryManagement_Handler
+ .long BusFault_Handler
+ .long UsageFault_Handler
+ .long 0
+ .long 0
+ .long 0
+ .long 0
+ .long SVC_Handler
+ .long DebugMon_Handler
+ .long 0
+ .long PendSV_Handler
+ .long SysTick_Handler
+
+ // Extra interrupts for peripherals defined by the hardware vendor.
+`))
+ err = t.Execute(w, device.metadata)
+ if err != nil {
+ return err
+ }
+ num := 0
+ for _, intr := range device.interrupts {
+ if intr.Value == num-1 {
+ continue
+ }
+ if intr.Value < num {
+ panic("interrupt numbers are not sorted")
+ }
+ for intr.Value > num {
+ w.WriteString(" .long 0\n")
+ num++
+ }
+ num++
+ fmt.Fprintf(w, " .long %s_IRQHandler\n", intr.Name)
+ }
+
+ w.WriteString(`
+ // Define default implementations for interrupts, redirecting to
+ // Default_Handler when not implemented.
+ IRQ NMI_Handler
+ IRQ HardFault_Handler
+ IRQ MemoryManagement_Handler
+ IRQ BusFault_Handler
+ IRQ UsageFault_Handler
+ IRQ SVC_Handler
+ IRQ DebugMon_Handler
+ IRQ PendSV_Handler
+ IRQ SysTick_Handler
+`)
+ for _, intr := range device.interrupts {
+ fmt.Fprintf(w, " IRQ %s_IRQHandler\n", intr.Name)
+ }
+ return w.Flush()
+}
+
+func generate(indir, outdir, sourceURL string) error {
+ if _, err := os.Stat(indir); os.IsNotExist(err) {
+ fmt.Fprintln(os.Stderr, "cannot find input directory:", indir)
+ os.Exit(1)
+ }
+ os.MkdirAll(outdir, 0777)
+
+ infiles, err := filepath.Glob(filepath.Join(indir, "*.svd"))
+ if err != nil {
+ fmt.Fprintln(os.Stderr, "could not read .svd files:", err)
+ os.Exit(1)
+ }
+ sort.Strings(infiles)
+ for _, infile := range infiles {
+ fmt.Println(infile)
+ device, err := readSVD(infile, sourceURL)
+ if err != nil {
+ return fmt.Errorf("failed to read: %w", err)
+ }
+ err = writeGo(outdir, device)
+ if err != nil {
+ return fmt.Errorf("failed to write Go file: %w", err)
+ }
+ err = writeAsm(outdir, device)
+ if err != nil {
+ return fmt.Errorf("failed to write assembly file: %w", err)
+ }
+ }
+ return nil
+}
+
+func main() {
+ sourceURL := flag.String("source", "<unknown>", "source SVD file")
+ flag.Parse()
+ if flag.NArg() != 2 {
+ fmt.Fprintln(os.Stderr, "provide exactly two arguments: input directory (with .svd files) and output directory for generated files")
+ flag.PrintDefaults()
+ return
+ }
+ indir := flag.Arg(0)
+ outdir := flag.Arg(1)
+ err := generate(indir, outdir, *sourceURL)
+ if err != nil {
+ fmt.Fprintln(os.Stderr, err)
+ os.Exit(1)
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 14:00:47 +0000