feat: handover + populate with dtb

src/kernel/hal/mod.h

@@ -11,3 +11,5 @@ Writer hal_writer(void);
 void hal_brkpoint(void);
 
 DTBNode* hal_dtb_root(void);
+
+size_t page_size(void);

src/kernel/hal/rv32/boot.c

@@ -1,17 +1,18 @@
 #include <dtb>
+#include <hal>
+#include <handover-dtb>
 #include <heap/bump.h>
 #include <helpers/mem.h>
 #include <logger>
-#include <stddef.h>
-#include <string.h>
+#include <pmm>
+#include <stdio.h>
 
 #include "exception.h"
-#include "mem.h"
 
 extern char __bss[], __bss_end[];
 extern void kmain(void);
 
-static uint8_t early_heap[kib$(20)];
+static uint8_t early_heap[kib$(32)];
 static DTBNode* dtb_root = NULL;
 
 void rv32_start(__attribute__((unused)) size_t hartid, uintptr_t dtb) {
@@ -20,7 +21,17 @@ void rv32_start(__attribute__((unused)) size_t hartid, uintptr_t dtb) {
     BumpAllocator alloc = bump_allocator_create((void*)early_heap, sizeof(early_heap));
     dtb_root            = dtb_init(dtb, &alloc.base);
 
-    mem_init();
+    handover_init(dtb_root, &alloc.base);
+    handover_append(handover(), (HandoverRecord){
+                                    .tag   = HANDOVER_LOADER,
+                                    .start = (uintptr_t)early_heap,
+                                    .size  = sizeof(early_heap),
+                                });
+
+    for (size_t i = 0; i < handover()->count; i++) {
+        debug$("%s (start: %x, len: %x)", handover_tag_name(handover()->records[i].tag), handover()->records[i].start, handover()->records[i].size);
+    }
+
     kmain();
 }
 

src/kernel/hal/rv32/hal.c

@@ -9,3 +9,7 @@ void hal_putc(int ch) {
 void hal_brkpoint(void) {
     __asm__ volatile("ebreak");
 }
+
+size_t page_size(void) {
+    return 4096;
+}

src/kernel/hal/rv32/manifest.json

@@ -7,5 +7,5 @@
         "sys": ["kernel"]
     },
     "provides": ["hal-impl"],
-    "requires": ["dtb"]
+    "requires": ["dtb", "pmm", "handover-dtb"]
 }

src/kernel/hal/rv32/mem.c

@@ -1,42 +0,0 @@
-#include <hal>
-#include <helpers/mem.h>
-#include <logger>
-
-#include "mem.h"
-
-void mem_init(void) {
-    DTBNode* root = hal_dtb_root();
-    if (root == NULL) {
-        error$("No DTB found");
-        hal_brkpoint();
-    }
-
-    DTBNode* mem = dtb_lookup(root, "memory");
-    if (mem == NULL) {
-        error$("No memory node found in DTB");
-        hal_brkpoint();
-    }
-
-    RegValue reg_val = dtb_lookup_reg(mem);
-    if (reg_val.len == 0) {
-        warn$("Memory node size is larger than 4GB. Defaulting to 4GB");
-        reg_val.len = align_down$(gib$(4) - 1, 4096);
-    }
-
-    debug$("Memory node found at %x with size %x", reg_val.addr, reg_val.len);
-
-    DTBNode* reserved = dtb_lookup(root, "reserved-memory");
-    if (reserved == NULL) {
-        error$("No reserved memory node found in DTB");
-        hal_brkpoint();
-    }
-
-    DTBNode* child = reserved->children;
-
-    while (child != NULL) {
-        RegValue reg = dtb_lookup_reg(child);
-        debug$("Reserved memory node with name %s found at %x with size %x", child->name, reg.addr, reg.len);
-
-        child = child->next;
-    }
-}

src/kernel/hal/rv32/mem.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void mem_init(void);

src/kernel/libs/libc/stdio.h

@@ -3,3 +3,8 @@
 #include <logger>
 
 #define printf(...) _log(LOG_INFO, loc$(), __VA_ARGS__)
+
+#define fprintf(TYPE, ...) _log(TYPE, loc$(), __VA_ARGS__)
+
+#define stdio  LOG_INFO
+#define stderr LOG_ERROR

src/kernel/pmm/manifest.json

@@ -0,0 +1,5 @@
+{
+    "$schema": "https://schemas.cute.engineering/stable/cutekit.manifest.component.v1",
+    "type": "lib",
+    "id": "pmm"
+}

src/kernel/pmm/mod.c

@@ -0,0 +1,14 @@
+#include "mod.h"
+#include <hal>
+#include <logger>
+
+Pmm* pmm = NULL;
+
+void pmm_init(size_t start, size_t len) {
+    (void)start;
+    (void)len;
+    if (pmm != NULL) {
+        error$("PMM already initialized");
+        hal_brkpoint();
+    }
+}

src/kernel/pmm/mod.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct _Page {
+    struct _Page* next;
+    uintptr_t addr;
+} Page;
+
+typedef struct {
+    size_t total_pages;
+    size_t free_pages;
+    Page* freelist;
+} Pmm;
+
+void pmm_init(size_t start, size_t len);

src/libs/handover/base/manifest.json

@@ -0,0 +1,5 @@
+{
+    "$schema": "https://schemas.cute.engineering/stable/cutekit.manifest.component.v1",
+    "type": "lib",
+    "id": "handover"
+}

src/libs/handover/base/mod.c

@@ -0,0 +1,158 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mod.h"
+
+char const* handover_tag_name(HandoverTag tag) {
+    switch (tag) {
+#define TAG(NAME, VALUE)  \
+    case HANDOVER_##NAME: \
+        return #NAME;
+        HANDOVER_TAGS(TAG)
+#undef TAG
+    }
+    return "UNKNOWN";
+}
+
+bool handover_mergeable(uint32_t tag) {
+    switch (tag) {
+    case HANDOVER_FREE:
+    case HANDOVER_LOADER:
+    case HANDOVER_KERNEL:
+    case HANDOVER_RESERVED:
+        return true;
+
+    default:
+        return false;
+    }
+}
+
+bool handover_overlap(HandoverRecord lhs, HandoverRecord rhs) {
+    return lhs.start < rhs.start + rhs.size && rhs.start < lhs.start + lhs.size;
+}
+
+bool handover_just_before(HandoverRecord lhs, HandoverRecord rhs) {
+    return lhs.start + lhs.size == rhs.start;
+}
+
+bool handover_just_after(HandoverRecord lhs, HandoverRecord rhs) {
+    return lhs.start == rhs.start + rhs.size;
+}
+
+HandoverRecord handover_half_under(HandoverRecord self, HandoverRecord other) {
+    if (handover_overlap(self, other) &&
+        self.start < other.start) {
+        return (HandoverRecord){
+            .tag   = self.tag,
+            .flags = 0,
+            .start = self.start,
+            .size  = other.start - self.start,
+        };
+    }
+
+    return (HandoverRecord){0};
+}
+
+HandoverRecord handover_half_over(HandoverRecord self, HandoverRecord other) {
+    if (handover_overlap(self, other) &&
+        self.start + self.size > other.start + other.size) {
+        return (HandoverRecord){
+            .tag   = self.tag,
+            .flags = 0,
+            .start = other.start + other.size,
+            .size  = self.start + self.size - other.start - other.size,
+        };
+    }
+
+    return (HandoverRecord){0};
+}
+
+void handover_insert(HandoverPayload* payload, size_t index, HandoverRecord record) {
+    for (size_t i = payload->count; i > index; i--) {
+        payload->records[i] = payload->records[i - 1];
+    }
+
+    payload->records[index] = record;
+    payload->count++;
+}
+
+void handover_remove(HandoverPayload* payload, size_t index) {
+    for (size_t i = index; i < payload->count - 1; i++) {
+        payload->records[i] = payload->records[i + 1];
+    }
+
+    payload->count--;
+}
+
+void handover_append(HandoverPayload* payload, HandoverRecord record) {
+    if (record.size == 0) {
+        return;
+    }
+
+    for (size_t i = 0; i < payload->count; i++) {
+        HandoverRecord other = payload->records[i];
+
+        if (record.tag == other.tag && handover_just_after(record, other) && handover_mergeable(record.tag)) {
+            handover_remove(payload, i);
+            other.size += record.size;
+            handover_append(payload, other);
+            return;
+        }
+
+        if (record.tag == other.tag && handover_just_before(record, other) && handover_mergeable(record.tag)) {
+            handover_remove(payload, i);
+            other.start -= record.size;
+            other.size += record.size;
+            handover_append(payload, other);
+            return;
+        }
+
+        if (handover_overlap(record, other)) {
+            if ((handover_mergeable(record.tag) && !handover_mergeable(other.tag)) || other.tag == HANDOVER_FREE) {
+                handover_remove(payload, i);
+
+                HandoverRecord lower = handover_half_under(other, record);
+                HandoverRecord upper = handover_half_over(other, record);
+
+                handover_append(payload, record);
+                handover_append(payload, lower);
+                handover_append(payload, upper);
+                return;
+            } else if (!handover_mergeable(record.tag) && handover_mergeable(other.tag)) {
+                handover_remove(payload, i);
+
+                HandoverRecord lower = handover_half_under(record, other);
+                HandoverRecord upper = handover_half_over(record, other);
+
+                handover_append(payload, other);
+                handover_append(payload, lower);
+                handover_append(payload, upper);
+                return;
+            } else {
+                fprintf(stderr, "handover: record %s (start: %x, len: %x) collides with %s (start: %x, len: %x)\n", handover_tag_name(record.tag), record.start, record.size, handover_tag_name(other.tag), other.start, other.size);
+                abort();
+            }
+        }
+
+        if (record.start < other.start) {
+            handover_insert(payload, i, record);
+            return;
+        }
+    }
+
+    payload->records[payload->count++] = record;
+}
+
+char const* handover_str(HandoverPayload const* payload, uint32_t offset) {
+    return (char const*)payload + offset;
+}
+
+size_t handover_add_string(HandoverPayload* handover, char const* str) {
+    size_t len    = strlen(str) + 1;
+    size_t offset = handover->size - len;
+    memset((void*)((uintptr_t)handover + offset), 0, len);
+    memcpy((void*)((uintptr_t)handover + offset), str, len);
+    handover->size -= len;
+    return offset;
+}

src/libs/handover/base/mod.h

@@ -0,0 +1,159 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+
+#ifdef __ck_bits_64__
+#    define KERNEL_BASE 0xffffffff80000000;
+#    define UPPER_HALF  0xffff800000000000;
+#else
+#    define KERNEL_BASE 0xc0000000;
+#    define UPPER_HALF  0xc0000000;
+#endif //!__ck_bits_64__
+
+#define HANDOVER_COOLBOOT 0xc001b001
+#define HANDOVER_SECTION  ".handover"
+
+#define HANDOVER_TAGS(TAG)        \
+    TAG(FREE, 0x00000000)         \
+    TAG(MAGIC, HANDOVER_COOLBOOT) \
+    TAG(SELF, 0xa24f988d)         \
+    TAG(STACK, 0xf65b391b)        \
+    TAG(KERNEL, 0xbfc71b20)       \
+    TAG(LOADER, 0xf1f80c26)       \
+    TAG(FILE, 0xcbc36d3b)         \
+    TAG(RSDP, 0x8ef29c18)         \
+    TAG(FDT, 0xb628bbc1)          \
+    TAG(FB, 0xe2d55685)           \
+    TAG(CMDLINE, 0x435140c4)      \
+    TAG(RESERVED, 0xb8841d2d)     \
+    TAG(END, 0xffffffff)
+
+typedef enum {
+
+#define TAG(NAME, VALUE) HANDOVER_##NAME = VALUE,
+    HANDOVER_TAGS(TAG)
+#undef TAG
+} HandoverTag;
+
+typedef struct
+{
+    uint32_t tag;
+    uint32_t flags;
+    uintptr_t start;
+    size_t size;
+
+    union {
+        struct
+        {
+            uint16_t width;
+            uint16_t height;
+            uint16_t pitch;
+
+#define HANDOVER_RGBX8888 0x7451
+#define HANDOVER_BGRX8888 0xd040
+            uint16_t format;
+        } fb;
+
+        struct
+        {
+            uint32_t name;
+            uint32_t meta;
+        } file;
+
+        uint64_t more;
+    };
+} HandoverRecord;
+
+typedef struct
+{
+    uint32_t magic, agent, size, count;
+    HandoverRecord records[];
+} HandoverPayload;
+
+typedef struct
+{
+    uint32_t tag;
+    uint32_t flags;
+    uint64_t more;
+} HandoverRequest;
+
+typedef void HandoverEntry(
+    uint64_t magic,
+    HandoverPayload const* payload
+);
+
+/* --- Header Utilities ----------------------------------------------------- */
+
+#define HANDOVER_REQ_START    \
+    {                         \
+        .tag = HANDOVER_MAGIC \
+    }
+
+#define HANDOVER_REQ_END    \
+    {                       \
+        .tag = HANDOVER_END \
+    }
+
+#define WITH_FB            \
+    {                      \
+        .tag = HANDOVER_FB \
+    }
+
+#define WITH_ACPI            \
+    {                        \
+        .tag = HANDOVER_RSDP \
+    }
+
+#define WITH_FDT            \
+    {                       \
+        .tag = HANDOVER_FDT \
+    }
+
+#define WITH_FILES           \
+    {                        \
+        .tag = HANDOVER_FILE \
+    }
+
+#define WITH_CMDLINE            \
+    {                           \
+        .tag = HANDOVER_CMDLINE \
+    }
+
+#define HANDOVER(...)                                                                             \
+    __attribute__((section(HANDOVER_SECTION), used)) static HandoverRequest handover_header[] = { \
+        {.tag = HANDOVER_MAGIC},                                                                  \
+        __VA_ARGS__ __VA_OPT__(, ){.tag = HANDOVER_END},                                          \
+    };
+
+/* --- Utilities ------------------------------------------------------------ */
+
+char const* handover_tag_name(HandoverTag tag);
+
+bool handover_mergeable(uint32_t tag);
+
+bool handover_overlap(HandoverRecord lhs, HandoverRecord rhs);
+
+bool handover_just_before(HandoverRecord lhs, HandoverRecord rhs);
+
+bool handover_just_after(HandoverRecord lhs, HandoverRecord rhs);
+
+HandoverRecord handover_half_under(HandoverRecord self, HandoverRecord other);
+
+HandoverRecord handover_half_over(HandoverRecord self, HandoverRecord other);
+
+void handover_insert(HandoverPayload* payload, size_t index, HandoverRecord record);
+
+void handover_remove(HandoverPayload* payload, size_t index);
+
+void handover_append(HandoverPayload* payload, HandoverRecord record);
+
+char const* handover_str(HandoverPayload const* payload, uint32_t offset);
+
+size_t handover_add_string(HandoverPayload* handover, char const* str);
+
+#pragma GCC diagnostic pop

src/libs/handover/dtb/manifest.json

@@ -0,0 +1,9 @@
+{
+    "$schema": "https://schemas.cute.engineering/stable/cutekit.manifest.component.v1",
+    "type": "lib",
+    "id": "handover-dtb",
+    "requires": [
+        "dtb",
+        "handover"
+    ]
+}

src/libs/handover/dtb/mod.c

@@ -0,0 +1,78 @@
+#include <helpers/mem.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "handover/base/mod.h"
+#include "logger/mod.h"
+#include "mod.h"
+
+static DTBNode* dtb_root        = NULL;
+static HandoverPayload* payload = NULL;
+
+static void handover_mmap(void) {
+    if (dtb_root == NULL) {
+        fprintf(stderr, "No DTB found");
+        abort();
+    }
+
+    DTBNode* mem = dtb_lookup(dtb_root, "memory");
+    if (mem == NULL) {
+        fprintf(stderr, "No memory node found in DTB");
+        abort();
+    }
+
+    RegValue reg_val = dtb_lookup_reg(mem);
+
+    if (reg_val.len == 0) {
+        printf("WARNING: Memory node size is larger than 4GB. Defaulting to 4GB");
+        reg_val.len = align_down$(gib$(4) - 1, 4096);
+    }
+
+    handover_append(payload, (HandoverRecord){
+                                 .tag   = HANDOVER_FREE,
+                                 .start = reg_val.addr,
+                                 .size  = reg_val.len,
+                             });
+
+    DTBNode* reserved = dtb_lookup(dtb_root, "reserved-memory");
+    if (reserved == NULL) {
+        fprintf(stderr, "No reserved memory node found in DTB");
+        abort();
+    }
+
+    DTBNode* child = reserved->children;
+    while (child != NULL) {
+        RegValue reg = dtb_lookup_reg(child);
+        handover_append(payload, (HandoverRecord){
+                                     .tag   = HANDOVER_RESERVED,
+                                     .start = reg.addr,
+                                     .size  = reg.len,
+                                 });
+        child = child->next;
+    }
+}
+
+void handover_init(DTBNode* dtb, Allocator* alloc) {
+    if (dtb_root != NULL) {
+        fprintf(stderr, "Handover is already initialized");
+        abort();
+    }
+
+    dtb_root = dtb;
+
+    payload = alloc->alloc(alloc, kib$(16));
+    if (payload == NULL) {
+        fprintf(stderr, "Failed to allocate memory for handover payload");
+        abort();
+    }
+
+    payload->count = 0;
+    payload->magic = HANDOVER_MAGIC;
+
+    handover_mmap();
+}
+
+HandoverPayload* handover(void) {
+    return payload;
+}

src/libs/handover/dtb/mod.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <dtb>
+#include <handover>
+#include <traits/allocator.h>
+
+void handover_init(DTBNode* dtb, Allocator* alloc);
+
+HandoverPayload* handover(void);

src/libs/helpers/misc.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#define GENERATE_ENUM(ENUM)     ENUM,
+#define GENERATE_STRING(STRING) #STRING,