refactor: decouple i386 specific instruction invocation

[lunaix-os.git] / lunaix-os / kernel / asm / i386 / proc.c

diff --git a/lunaix-os/kernel/asm/i386/proc.c b/lunaix-os/kernel/asm/i386/proc.c
new file mode 100644 (file)
index 0000000..67f3f73
--- /dev/null
+++ b/lunaix-os/kernel/asm/i386/proc.c
@@ -0,0 +1,28 @@
+#include <lunaix/process.h>
+
+void
+proc_init_transfer(struct proc_info* proc,
+                   ptr_t stack_top,
+                   ptr_t target,
+                   int flags)
+{
+    struct exec_param* execp =
+      (struct exec_param*)(stack_top - sizeof(struct exec_param));
+    isr_param* isrp = (isr_param*)((ptr_t)execp - sizeof(isr_param));
+
+    *execp = (struct exec_param){
+        .cs = KCODE_SEG, .ss = KDATA_SEG, .eip = target, .eflags = cpu_ldstate()
+    };
+
+    *isrp = (isr_param){ .registers = { .ds = KDATA_SEG,
+                                        .es = KDATA_SEG,
+                                        .fs = KDATA_SEG,
+                                        .gs = KDATA_SEG },
+                         .execp = execp };
+
+    if ((flags & TRANSFER_IE)) {
+        execp->eflags |= 0x200;
+    }
+
+    proc->intr_ctx = isrp;
+}
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