feat: handing over the handover

meta/targets/navy-x86_64.json

@@ -26,7 +26,8 @@
                 "-mno-mmx",
                 "-mno-3dnow",
                 "-mno-sse",
-                "-mno-sse2"
+                "-mno-sse2",
+                "-g"
             ]
         },
         "cxx": {

src/kernel/archs/x86_64/ctx.h

@@ -6,7 +6,12 @@
 
 #define STACK_SIZE        (kib$(4))
 #define KERNEL_STACK_SIZE (0x1000)
-#define USER_STACK_BASE   (0xff0000000)
+#define USER_STACK_TOP    (0x7fffffffe000)
+#define USER_STACK_SIZE   (mib$(2))
+#define USER_STACK_BASE   (USER_STACK_TOP - USER_STACK_SIZE)
+#define USER_HEAP_BASE    (0x80000000000)
+#define USER_HEAP_SIZE    (gib$(4))
+#define USER_HEAP_TOP     (USER_HEAP_BASE + USER_HEAP_SIZE)
 
 struct _HalContext
 {

src/kernel/core/main.c

@@ -15,6 +15,8 @@ _Noreturn int _start()
         hal_panic();
     }
 
+    vmem_bootstrap();
+
     Res hal = hal_setup();
     if (hal.type != RES_OK)
     {

src/kernel/core/manifest.json

@@ -7,7 +7,8 @@
         "dbg",
         "stdc-shim",
         "loader",
-        "kmalloc"
+        "kmalloc",
+        "tinyvmem"
     ],
     "tools": {
         "cc": {

src/kernel/core/pre-sched.c

@@ -1,7 +1,11 @@
 #include <dbg/log.h>
+#include <hal.h>
 #include <handover.h>
+#include <kmalloc/kmalloc.h>
+#include <math.h>
 #include <specs/elf.h>
 #include <string.h>
+#include <tinyvmem/tinyvmem.h>
 
 #include "hal.h"
 #include "pmm.h"
@@ -19,6 +23,7 @@
 
 static HalPage *sched_vspace;
 static HalContext *sched_ctx;
+static Vmem sched_vmem;
 
 static HalContext *kernel_ctx;
 static bool need_switch = false;
@@ -33,6 +38,8 @@ Res load_scheduler(void)
 
     try$(hal_space_create(&sched_vspace));
 
+    vmem_init(&sched_vmem, "procman", (void *)USER_HEAP_BASE, USER_HEAP_SIZE, PMM_PAGE_SIZE, 0, 0, 0, 0, 0);
+
     Elf_Ehdr *hdr = (Elf_Ehdr *)sched.start;
     if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
     {
@@ -76,9 +83,24 @@ Res load_scheduler(void)
         return err$(RES_NOMEM);
     }
 
-    hal_space_map(sched_vspace, USER_STACK_BASE, sched_stack_obj.base, STACK_SIZE, HAL_MEM_READ | HAL_MEM_WRITE | HAL_MEM_USER);
+    HandoverBuilder builder;
+    PmmObj handover_obj = pmm_alloc(align_up$(kib$(16), PMM_PAGE_SIZE) / PMM_PAGE_SIZE);
+    if (handover_obj.len == 0)
+    {
+        return err$(RES_NOMEM);
+    }
 
-    hal_context_start(sched_ctx, hdr->e_entry, USER_STACK_BASE, (SysArgs){0, 0, 0, 0, 0, 0});
+    handover_builder_init(&builder, (void *)hal_mmap_l2h(handover_obj.base), kib$(16));
+    handover_parse_module(&builder);
+
+    builder.payload->magic = HANDOVER_MAGIC;
+
+    uintptr_t handover_addr = (uintptr_t)vmem_alloc(&sched_vmem, kib$(16), VM_INSTANTFIT);
+
+    try$(hal_space_map(sched_vspace, align_down$(handover_addr, PMM_PAGE_SIZE), align_down$((uintptr_t)handover_obj.base, PMM_PAGE_SIZE), 
+        align_up$(builder.size, PMM_PAGE_SIZE), HAL_MEM_READ | HAL_MEM_USER));
+    try$(hal_space_map(sched_vspace, USER_STACK_BASE, sched_stack_obj.base, STACK_SIZE, HAL_MEM_READ | HAL_MEM_WRITE | HAL_MEM_USER));
+    hal_context_start(sched_ctx, hdr->e_entry, USER_STACK_BASE, (SysArgs){handover_addr, 0, 0, 0, 0, 0});
     need_switch = true;
 
     return ok$();

src/kernel/klibs/limine/handover.c

@@ -55,7 +55,7 @@ void handover_parse_mmap(HandoverBuilder *self)
         error$("Couldn't retrieve memory map from Limine");
         hal_panic();
     }
-    
+
     if (kernel_addr_req.response == NULL)
     {
         error$("Couldn't retrieve kernel address from Limine");
@@ -215,7 +215,6 @@ HandoverPayload *handover(void)
         handover_parse_mmap(&builder);
 
         is_handover_init = true;
-
     }
 
     return builder.payload;

src/kernel/klibs/tinyvmem/manifest.json

@@ -1,7 +1,7 @@
 {
     "$schema": "https://schemas.cute.engineering/stable/cutekit.manifest.component.v1",
     "type": "lib",
-    "id": "mem",
+    "id": "tinyvmem",
     "requires": [
         "dbg",
         "stdc-shim"

src/kernel/klibs/tinyvmem/tinyvmem.c

@@ -7,6 +7,7 @@
  */
 
 #include <string.h>
+#include <sync/spinlock.h>
 #include <sys/queue.h>
 
 #include "tinyvmem.h"
@@ -21,6 +22,7 @@
 #else
 #    include <dbg/log.h>
 #    include <hal.h>
+
 #    include "../../core/pmm.h"
 #    define vmem_printf(...) ((void)0)
 #    define ASSERT(x)        (x ? (void)0 : _ASSERT(__FILE__, __LINE__, #x))
@@ -74,8 +76,17 @@ static int nfreesegs = 0;
 
 #ifdef __ck_sys_kernel__
 
-void vmem_lock(void);
-void vmem_unlock(void);
+static Spinlock lock = SPINLOCK_INIT;
+
+void vmem_lock(void)
+{
+    spinlock_acquire(&lock);
+}
+
+void vmem_unlock(void)
+{
+    spinlock_release(&lock);
+}
 
 #else
 #    define vmem_lock()

src/srvs/procman/main.c

@@ -1,7 +1,17 @@
 #include <dbg/log.h>
+#include <handover/handover.h>
+#include <stdint.h>
 
-_Noreturn int _start()
+_Noreturn int _start(uintptr_t handover_addr)
 {
+    HandoverPayload *handover = (HandoverPayload *)handover_addr;
+
+    if (handover->magic != HANDOVER_MAGIC)
+    {
+        error$("Invalid handover magic");
+        for (;;);
+    }
+
     log$("Hello, world!");
     for (;;)
         ;