From dc42353f53df0b5425377330f16e668829d8fd9a Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 5 May 2022 21:01:25 +0200
Subject: kernel: ps2 driver is now a separate backend

---
 src/kernel/arch/i386/driver/ps2.c | 40 +++++++++++++++++++++++++++++++++++++++
 src/kernel/arch/i386/driver/ps2.h |  4 ++++
 2 files changed, 44 insertions(+)

(limited to 'src/kernel/arch')

diff --git a/src/kernel/arch/i386/driver/ps2.c b/src/kernel/arch/i386/driver/ps2.c
index 4b7eae4..6ee24e2 100644
--- a/src/kernel/arch/i386/driver/ps2.c
+++ b/src/kernel/arch/i386/driver/ps2.c
@@ -1,20 +1,60 @@
 #include <kernel/arch/i386/driver/ps2.h>
 #include <kernel/arch/i386/interrupts/irq.h>
+#include <kernel/mem/virt.h>
+#include <kernel/panic.h>
 #include <shared/container/ring.h>
 #include <shared/mem.h>
 
+
 #define BACKLOG_CAPACITY 64
 static volatile uint8_t backlog_buf[BACKLOG_CAPACITY];
 static volatile ring_t backlog = {(void*)backlog_buf, BACKLOG_CAPACITY, 0, 0};
 
+static struct vfs_request *blocked_on = NULL;
+
 bool ps2_ready(void) {
 	return ring_size((void*)&backlog) > 0;
 }
 
 void ps2_recv(uint8_t s) {
 	ring_put1b((void*)&backlog, s);
+	if (blocked_on) {
+		vfs_ps2_accept(blocked_on);
+		blocked_on = NULL;
+	}
 }
 
 size_t ps2_read(uint8_t *buf, size_t len) {
 	return ring_get((void*)&backlog, buf, len);
 }
+
+int vfs_ps2_accept(struct vfs_request *req) {
+	static uint8_t buf[32]; // pretty damn stupid
+	int ret;
+	switch (req->type) {
+		case VFSOP_OPEN:
+			// allows opening /ps2/anything, TODO don't
+			return vfsreq_finish(req, 0); // fake file handle, whatever
+		case VFSOP_READ:
+			if (ps2_ready()) {
+				// TODO FUKKEN MESS
+				if (req->caller) {
+					// clamp between 0, sizeof buf
+					ret = req->output.len;
+					if (ret > sizeof buf) ret = sizeof buf;
+					if (ret < 0) ret = 0;
+
+					ret = ps2_read(buf, ret);
+					virt_cpy_to(req->caller->pages, req->output.buf, buf, ret);
+				} else ret = -1;
+				return vfsreq_finish(req, ret);
+			} else {
+				blocked_on = req;
+				return -1;
+			}
+		default:
+			return vfsreq_finish(req, -1);
+	}
+}
+
+bool vfs_ps2_ready(struct vfs_backend *self) { return blocked_on == NULL; }
diff --git a/src/kernel/arch/i386/driver/ps2.h b/src/kernel/arch/i386/driver/ps2.h
index 712b157..1bbc2f1 100644
--- a/src/kernel/arch/i386/driver/ps2.h
+++ b/src/kernel/arch/i386/driver/ps2.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <kernel/vfs/request.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
@@ -6,3 +7,6 @@
 bool	ps2_ready(void);
 void	ps2_recv(uint8_t scancode);
 size_t	ps2_read(uint8_t *buf, size_t max_len);
+
+int vfs_ps2_accept(struct vfs_request *);
+bool vfs_ps2_ready(struct vfs_backend *);
-- 
cgit v1.2.3