Implement debug console device

kernel/amd64/bootmain.c

@@ -64,7 +64,7 @@ void bootmain (void) {
   vfs_create_volume ("RD", FS_TARFS, rd0, false);
 
   struct device* temp0 = device_find ("TEMP0");
-  int x = vfs_create_volume ("TEMP", FS_FAT16, temp0, true);
+  vfs_create_volume ("TEMP", FS_FAT16, temp0, true);
 
   proc_pid_alloc_init ();
   procgroup_pgid_alloc_init ();

kernel/device/debugconsole.c

@@ -0,0 +1,33 @@
+#include <device/debugconsole.h>
+#include <device/device.h>
+#include <libk/std.h>
+#include <proc/proc.h>
+#include <proc/reschedule.h>
+#include <status.h>
+#include <sys/debug.h>
+
+bool debugconsole_init (struct device* device, void* arg) {
+  (void)device, (void)arg;
+  return true;
+}
+
+void debugconsole_fini (struct device* device) { (void)device; }
+
+int debugconsole_putstr (struct device* device, struct proc* proc, struct reschedule_ctx* rctx,
+                         void* a1, void* a2, void* a3, void* a4) {
+  (void)a2, (void)a3, (void)a4, (void)device, (void)rctx;
+
+  char* string = (char*)a1;
+  size_t* len = (size_t*)a2;
+
+  if (string == NULL || len == NULL)
+    return -ST_BAD_ADDRESS_SPACE;
+
+  spin_lock (&proc->lock);
+  int pid = proc->pid;
+  spin_unlock (&proc->lock);
+
+  debugprintf ("(CPU %d; PID %d) %.*s\n", thiscpu->id, pid, (int)*len, string);
+
+  return ST_OK;
+}

kernel/device/debugconsole.h

@@ -0,0 +1,17 @@
+#ifndef _KERNEL_DEVICE_DEBUGCONSOLE_H
+#define _KERNEL_DEVICE_DEBUGCONSOLE_H
+
+#include <libk/std.h>
+#include <proc/proc.h>
+#include <proc/reschedule.h>
+
+struct device;
+
+bool debugconsole_init (struct device* device, void* arg);
+
+void debugconsole_fini (struct device* device);
+
+int debugconsole_putstr (struct device* device, struct proc* proc, struct reschedule_ctx* rctx,
+                         void* a1, void* a2, void* a3, void* a4);
+
+#endif // _KERNEL_DEVICE_DEBUGCONSOLE_H

kernel/device/device.c

@@ -1,7 +1,7 @@
+#include <device/debugconsole.h>
 #include <device/device.h>
 #include <device/partdrv.h>
 #include <device/partitions.h>
-#include <device/pci.h>
 #include <device/ramdrv.h>
 #include <device/terminal.h>
 #include <devices.h>
@@ -21,6 +21,7 @@
 #include <sys/debug.h>
 
 #if defined(__x86_64__)
+#include <device/pci.h>
 #include <device/ps2_kb.h>
 #endif
 
@@ -85,7 +86,14 @@ struct device* device_create (const char* key, device_op_func_t* ops, size_t ops
   return device;
 }
 
-void terminal_device_init (void) {
+static void debugconsole_device_init (void) {
+  device_op_func_t ops[] = {
+      [DEBUGCONSOLE_PUTSTR] = &debugconsole_putstr,
+  };
+  device_create ("DEBUGCONSOLE", ops, lengthof (ops), &debugconsole_init, &debugconsole_fini, NULL);
+}
+
+static void terminal_device_init (void) {
   device_op_func_t ops[] = {
       [TERMINAL_PUTSTR] = &terminal_putstr,
       [TERMINAL_DIMENSIONS] = &terminal_dimensions,
@@ -93,7 +101,7 @@ void terminal_device_init (void) {
   device_create ("TERMINAL", ops, lengthof (ops), &terminal_init, &terminal_fini, NULL);
 }
 
-void ramdisk_device_init (void) {
+static void ramdisk_device_init (void) {
   device_op_func_t ops[] = {
       [XDRV_GET_SIZE] = &ramdrv_get_size,
       [XDRV_GET_SECTOR_SIZE] = &ramdrv_get_sector_size,
@@ -136,7 +144,7 @@ void ramdisk_device_init (void) {
   LZ4F_freeDecompressionContext (dctx);
 }
 
-void temp_device_init (void) {
+static void temp_device_init (void) {
   device_op_func_t ops[] = {
       [XDRV_GET_SIZE] = &ramdrv_get_size,
       [XDRV_GET_SECTOR_SIZE] = &ramdrv_get_sector_size,
@@ -153,7 +161,7 @@ void temp_device_init (void) {
 }
 
 #if defined(__x86_64__)
-void ps2kb_device_init (void) {
+static void ps2kb_device_init (void) {
   device_op_func_t ops[] = {
       [KB_READ_KEY] = &ps2kb_read_key,
   };
@@ -167,6 +175,7 @@ void devices_init (void) {
   terminal_device_init ();
   ramdisk_device_init ();
   temp_device_init ();
+  debugconsole_device_init ();
 
 #if defined(__x86_64__)
   ps2kb_device_init ();

kernel/device/src.mk

@@ -2,13 +2,15 @@ c += device/device.c \
 		 device/terminal.c \
 		 device/ramdrv.c \
 		 device/partdrv.c \
-		 device/partitions.c
+		 device/partitions.c \
+		 device/debugconsole.c
 
 o += device/device.o \
 		 device/terminal.o \
 		 device/ramdrv.o \
 		 device/partdrv.o \
-		 device/partitions.o
+		 device/partitions.o \
+		 device/debugconsole.o
 
 ifeq ($(platform),amd64)
 	c += device/ps2_kb.c \

kernel/device/terminal.h

@@ -7,7 +7,6 @@
 #include <proc/reschedule.h>
 
 struct device;
-struct device_op_ctx;
 
 bool terminal_init (struct device* device, void* arg);