Record networking and DMA development progress
Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.
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/* DKM ACPI Driver - RSDP scan / RSDT parse / table enumeration
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* Stage 0, optional, provides "acpi".
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* Scans BIOS memory for RSDP, then walks RSDT/XSDT to list all ACPI tables.
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*/
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#include <stdint.h>
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/* ---------------------------------------------------------------
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* DKM ABI types
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* --------------------------------------------------------------- */
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#define DKM_DRIVER_MAGIC 0x444B4D31u
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#define DKM_ABI_VERSION 1u
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef long long i64;
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#define NULL ((void *)0)
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struct dkm_log_api {
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void (*info)(const char *msg);
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void (*warn)(const char *msg);
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void (*error)(const char *msg);
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void (*panic)(const char *msg);
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};
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struct dkm_kernel_api {
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u32 version;
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u32 size;
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u64 feature_bits;
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const struct dkm_log_api *log;
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const void *mem;
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const void *utsm;
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const void *irq;
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const void *pci;
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const void *dma;
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const void *vfs;
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const void *net;
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const void *timer;
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const void *drr;
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const void *rsdp_address;
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};
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struct dkm_driver_handle;
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struct dkm_driver_desc {
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u32 magic;
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u16 abi_version;
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u16 desc_size;
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const char *name;
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const char *version;
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const char *vendor;
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u32 driver_class;
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u32 stage;
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u32 flags;
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u32 priority;
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const char *const *depends;
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u32 depends_count;
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const char *const *provides;
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u32 provides_count;
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u64 min_kernel_abi;
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u64 feature_bits;
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u64 reserved0;
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u64 reserved1;
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};
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/* ---------------------------------------------------------------
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* ACPI structures
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* --------------------------------------------------------------- */
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typedef struct __attribute__((packed)) {
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char signature[8];
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u8 checksum;
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char oem_id[6];
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u8 revision;
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u32 rsdt_addr;
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} acpi_rsdp_v1;
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typedef struct __attribute__((packed)) {
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/* RSDP v1 fields */
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char signature[8];
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u8 checksum;
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char oem_id[6];
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u8 revision;
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u32 rsdt_addr;
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/* RSDP v2+ fields */
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u32 length;
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u64 xsdt_addr;
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u8 ext_checksum;
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u8 reserved[3];
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} acpi_rsdp_v2;
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typedef struct __attribute__((packed)) {
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char signature[4];
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u32 length;
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u8 revision;
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u8 checksum;
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char oem_id[6];
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char oem_table_id[8];
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u32 oem_revision;
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u32 creator_id;
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u32 creator_revision;
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} acpi_sdt_header;
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/* ---------------------------------------------------------------
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* Driver descriptor
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* --------------------------------------------------------------- */
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static const char *const g_provides[] = { "acpi" };
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__attribute__((visibility("default"), used))
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const struct dkm_driver_desc driver_desc = {
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.magic = DKM_DRIVER_MAGIC,
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.abi_version = DKM_ABI_VERSION,
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.desc_size = sizeof(struct dkm_driver_desc),
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.name = "acpi",
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.version = "0.1.0",
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.vendor = "Deshab",
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.driver_class = 1, /* DKM_CLASS_PLATFORM */
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.stage = 0,
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.flags = 0, /* optional */
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.priority = 0,
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.depends = NULL,
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.depends_count = 0,
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.provides = g_provides,
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.provides_count = 1,
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.min_kernel_abi = 1,
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.feature_bits = 0,
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.reserved0 = 0,
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.reserved1 = 0
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};
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/* ---------------------------------------------------------------
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* Helpers
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* --------------------------------------------------------------- */
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static const struct dkm_log_api *g_log;
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static u32 min_u32(u32 a, u32 b) { return a < b ? a : b; }
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static int memneq(const char *a, const char *b, u32 n) {
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for (u32 i = 0; i < n; i++) {
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if (a[i] != b[i]) return 1;
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}
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return 0;
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}
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static u8 checksum8(const u8 *data, u32 len) {
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u8 sum = 0;
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for (u32 i = 0; i < len; i++) {
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sum += data[i];
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}
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return sum;
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}
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static void log_hex(const char *prefix, u64 val) {
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static const char hex[] = "0123456789abcdef";
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char buf[32];
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u32 pos = 0;
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while (pos < 30) { buf[pos] = 0; pos++; }
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pos = 0;
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buf[pos++] = '0';
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buf[pos++] = 'x';
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for (int i = 15; i >= 0; i--) {
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buf[pos++] = hex[(val >> (i * 4)) & 0xf];
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}
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buf[pos] = 0;
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/* manual concat via serial_write-like approach: pass prefix then buf */
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g_log->info(prefix);
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g_log->info(buf);
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}
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/* ---------------------------------------------------------------
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* RSDP scan
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* --------------------------------------------------------------- */
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static const acpi_rsdp_v2 *acpi_find_rsdp(const void *limine_rsdp) {
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/* If Limine gave us the RSDP, use it directly */
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if (limine_rsdp) {
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const acpi_rsdp_v2 *rsdp = (const acpi_rsdp_v2 *)limine_rsdp;
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if (memneq(rsdp->signature, "RSD PTR ", 8) == 0) {
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if (checksum8((const u8 *)rsdp, 20) == 0) {
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return rsdp;
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}
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}
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}
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/* EBDA: extended BIOS data area, base at 0x40E */
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{
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u16 ebda_seg = *(const volatile u16 *)(uintptr_t)0x40E;
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u64 ebda_base = (u64)ebda_seg << 4;
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if (ebda_base >= 0x80000ULL && ebda_base < 0x100000ULL) {
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for (u64 off = 0; off < 1024; off += 16) {
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const acpi_rsdp_v2 *rsdp = (const acpi_rsdp_v2 *)(uintptr_t)(ebda_base + off);
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if (off + sizeof(acpi_rsdp_v1) > 1024) break;
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if (memneq(rsdp->signature, "RSD PTR ", 8) == 0) {
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if (checksum8((const u8 *)rsdp, 20) == 0) {
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return rsdp;
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}
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}
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}
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}
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}
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/* BIOS read-only area: 0x000E0000 - 0x000FFFFF */
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for (u64 addr = 0x000E0000ULL; addr < 0x00100000ULL; addr += 16) {
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const acpi_rsdp_v2 *rsdp = (const acpi_rsdp_v2 *)(uintptr_t)addr;
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if (memneq(rsdp->signature, "RSD PTR ", 8) == 0) {
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if (checksum8((const u8 *)rsdp, 20) == 0) {
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return rsdp;
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}
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}
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}
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return NULL;
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}
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/* ---------------------------------------------------------------
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* Table enumeration
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* --------------------------------------------------------------- */
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static void acpi_enumerate_rsdt(const acpi_sdt_header *rsdt, u32 entry_size) {
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u32 entry_count = (rsdt->length - sizeof(acpi_sdt_header)) / entry_size;
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const u8 *entries = (const u8 *)rsdt + sizeof(acpi_sdt_header);
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g_log->info("[acpi] tables found");
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for (u32 i = 0; i < entry_count; i++) {
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u64 addr;
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if (entry_size == 4) {
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addr = (u64)((const u32 *)entries)[i];
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} else {
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addr = ((const u64 *)entries)[i];
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}
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if (addr == 0) continue;
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const acpi_sdt_header *hdr = (const acpi_sdt_header *)(uintptr_t)addr;
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char sig[5];
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sig[0] = hdr->signature[0];
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sig[1] = hdr->signature[1];
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sig[2] = hdr->signature[2];
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sig[3] = hdr->signature[3];
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sig[4] = 0;
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g_log->info("[acpi] ");
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g_log->info(sig);
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log_hex("[acpi] addr=", addr);
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log_hex("[acpi] len =", (u64)hdr->length);
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}
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}
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/* ---------------------------------------------------------------
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* Driver entry points
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* --------------------------------------------------------------- */
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__attribute__((visibility("default")))
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int driver_init(const struct dkm_kernel_api *api,
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struct dkm_driver_handle *handle) {
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(void)handle;
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if (!api || !api->log) {
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return -1;
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}
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g_log = api->log;
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g_log->info("[acpi] scanning for RSDP");
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const acpi_rsdp_v2 *rsdp = acpi_find_rsdp(api->rsdp_address);
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if (!rsdp) {
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g_log->error("[acpi] RSDP not found");
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return 0; /* optional driver, don't fail boot */
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}
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g_log->info("[acpi] RSDP found");
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log_hex("[acpi] revision =", (u64)rsdp->revision);
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g_log->info("[acpi] oem_id");
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{
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char oem[7];
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for (int i = 0; i < 6; i++) oem[i] = rsdp->oem_id[i];
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oem[6] = 0;
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g_log->info(oem);
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}
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if (rsdp->revision >= 2 && rsdp->xsdt_addr) {
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g_log->info("[acpi] using XSDT");
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const acpi_sdt_header *xsdt = (const acpi_sdt_header *)(uintptr_t)rsdp->xsdt_addr;
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acpi_enumerate_rsdt(xsdt, 8);
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} else if (rsdp->rsdt_addr) {
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g_log->info("[acpi] using RSDT");
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const acpi_sdt_header *rsdt = (const acpi_sdt_header *)(uintptr_t)rsdp->rsdt_addr;
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acpi_enumerate_rsdt(rsdt, 4);
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} else {
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g_log->warn("[acpi] no RSDT/XSDT address");
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}
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g_log->info("[acpi] driver ready");
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return 0;
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}
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__attribute__((visibility("default")))
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int driver_exit(struct dkm_driver_handle *handle) {
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(void)handle;
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return 0;
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}
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