Import backup from 2006-01-02

kernel/proc/proc.cpp

@@ -22,11 +22,11 @@ extern u32_t mm_freepages;
 #include "proc/hash.h"
 
 extern "C" {
-u32_t	cur_task = 0;
-u32_t	n_processes = 0;
+u32_t	cur_task = 0;		/* PID of currently executing process */
+u32_t	n_processes = 0;	/* total number of processes */
 tss_t	tss0;
 u32_t	pid_base = 1024;
-u32_t	pid_index = 0;
+u32_t	pid_index = 0;		/* index of running process in 'pids' vector */
 }
 
 hash	*processes;
@@ -48,6 +48,11 @@ int	proc_init()
 	return 0;
 }
 
+process_t *proc_get_struct(u32_t pid)
+{
+	return (process_t *) processes->get(pid);
+}
+
 void	proc_sched(int_stack_t *int_stack)
 {
 	u32_t new_pid_index = (pid_index + 1) % pids->size();
@@ -125,7 +130,7 @@ void	create_address_space(process_t *p)
 	u32_t *ptr32 = p->page_dir;
 	for (i = 0; i < 768; i++)			/* zero 3 gigs */
 		*ptr32++ = 0;
-	memcpyd(ptr32, (void *)0xFFFFFC00, 256);		/* 1 gig kernel mem */
+	memcpyd(ptr32, (void *)0xFFFFFC00, 256);	/* 1 gig kernel mem */
 }
 
 void	create_process_stack(process_t *p, void *entry)
@@ -146,7 +151,7 @@ void	create_process_stack(process_t *p, void *entry)
 	p->int_stack.fs = SEG_USER_DATA | 0x3;
 	p->int_stack.gs = SEG_USER_DATA | 0x3;
 	p->int_stack.ss = SEG_USER_DATA | 0x3;
-	p->int_stack.esp = 0x20000000;
+	p->int_stack.esp = 0x80000000;			/* esp at 2GB */
 	p->int_stack.eflags = 0x0202;
 	p->int_stack.cs = SEG_USER_CODE | 0x3;
 	p->int_stack.eip = (u32_t)entry;

kernel/proc/proc.h

@@ -68,6 +68,8 @@ typedef struct
 } __attribute__((packed)) tss_t;
 
 int	proc_init();
+process_t *proc_get_struct(u32_t pid);
+
 void	proc_sched(int_stack_t *int_stack);
 u32_t	get_pid();
 void	switch_task(int_stack_t *int_stack, u32_t new_task);