add mini_kernel4 to demo the keyboard driver

mini_kernel4/.gdb_history

@@ -0,0 +1,151 @@
+target remote :1234
+b kernel_entry 
+c
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+si
+c
+disass
+info reg
+si
+p/x addr
+info reg
+quit
+b kernel_entry 
+target remote :1234
+c
+disas
+s
+s
+quit
+target remote :1234
+c
+x
+target remote :1234
+c
+b kernel_entry 
+quit
+target remote :1234
+b kernel_entry 
+c
+p str
+s
+disas
+si
+si
+info reg
+si
+info reg
+quit
+target remote :1234
+b kernel_entry 
+c
+s
+disass
+si
+info reg
+quit
+target remote :1234
+b kernel_entry 
+c
+s
+s
+s
+disass
+si
+info reg
+si
+c
+quit
+target remote :1234
+b kernel_entry 
+c
+s
+quit
+target remote :1234
+b kernel_entry 
+c
+s
+disass
+si
+info reg
+si
+quit
+target remote :1234
+b kernel_entry 
+c
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+quit
+target remote :1234
+b kernel_entry 
+c
+disas
+disas
+x 0x100000
+quit
+target remote :1234
+b kernel_entry 
+c
+x 0x100000
+x 0x101fe0
+quit
+target remote :1234
+b kernel_entry 
+c
+c
+target remote :1234
+c
+c
+target remote :1234
+c
+c
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+quit
+target remote :1234
+b kernel_entry 
+c
+disass
+quit
+target remote :1234
+b kernel_entry 
+c
+s
+s
+x/s str
+p/s str
+s
+p str
+s
+s
+s
+l
+s
+s
+s
+s
+s
+quit
+target remote :1234
+c
+quit

mini_kernel4/Makefile

@@ -0,0 +1,22 @@
+OBJS := serial.o printf.o hello_kernel.o trap.o trap_entry.o extioi.o ls7a_intc.o pckbd.o
+TOOLPREFIX = loongarch64-unknown-linux-gnu-
+
+CC = $(TOOLPREFIX)gcc
+LD = $(TOOLPREFIX)ld
+
+CFLAGS = -Wall -Wno-warn -O2 -g3 -march=loongarch64 -mabi=lp64s -ffreestanding -fno-common -nostdlib -I. -fno-stack-protector -fno-pie -no-pie 
+LDFLAGS = -z max-page-size=4096
+
+kernel: $(OBJS) ld.script
+	$(LD) $(LDFLAGS) -T ld.script -o kernel $(OBJS)
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+%.o : %.S
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+all: kernel 
+
+clean: 
+	rm -f *.o ./kernel

mini_kernel4/README.MD

@@ -0,0 +1,57 @@
+# mini kernel
+
+在mini kernel3的基础上，展示键盘中断处理。
+
+## 注意1: 要使用本测试，模拟器需要更新到以下commit之后的版本。
+
+    commit ac069a8ffb8f41fcbc7ed0aa5d420a71fff36581 (HEAD -> loongarch, origin/loongarch)
+    Author: Zhang Fuxin <fxzhang@ict.ac.cn>
+    Date:   Sun Jun 19 17:10:49 2022 +0800
+
+        add pc keyboard support.
+        
+        The pc PS2 keyboard controller is added at 0x1fe00060, with
+        keyboard interrupt connected to ls7a irq 3/4.
+
+## 注意2: 为了方便观察输出，启动命令行可以设为：
+
+    ./qemu-system-loongarch64 -m 4G -smp 1 -bios ./loongarch_bios_0310.bin -kernel ./mini_kernel4/kernel -vga virtio -serial stdio
+
+其中-vga选项使能图形选项，键盘输入只有在有图形界面的情况下起作用。-serial stdio在命令行界面实现一个模拟串口，用于观察内核的输出。
+
+
+## 预期界面
+
+在图形界面试图输入一些键，每输入一个键，应该有两次键盘中断，内核打印出其扫描码。
+
+命令行输出：
+
+    There is 2 args for kernel:
+    cmd arg 0: a0
+    cmd arg 1: root=/dev/ram console=ttyS0,115200 rdinit=/init
+    efi system table at 0x00000000fffd0018
+    efi extend list at 0x00000000fffda430
+    keyboard reponse 55
+    test result 0
+    reset result fa
+
+    estat 4, ecfg bfc
+    era=0x00000000001005d8 eentry=0x0000000000101000
+    irq=1c
+    aa key done
+    mouse interrupt
+
+    estat 800, ecfg bfc
+    era=0x000000000010036c eentry=0x0000000000101000
+    timer interrupt
+
+    estat 4, ecfg bfc
+    era=0x000000000010036c eentry=0x0000000000101000
+    irq=8
+    29 key done
+
+    estat 4, ecfg bfc
+    era=0x000000000010036c eentry=0x0000000000101000
+    irq=8
+    f0 29 key done
+

mini_kernel4/boot_param.h

@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* copied from linux source */
+#ifndef __ASM_BOOT_PARAM_H_
+#define __ASM_BOOT_PARAM_H_
+
+#ifdef CONFIG_VT
+#include <linux/screen_info.h>
+#endif
+
+/* add necessary defines */
+typedef unsigned char u8;
+typedef unsigned int u32;
+typedef unsigned long u64;
+#define __packed                        __attribute__((__packed__))
+
+#define ADDRESS_TYPE_SYSRAM	1
+#define ADDRESS_TYPE_RESERVED	2
+#define ADDRESS_TYPE_ACPI	3
+#define ADDRESS_TYPE_NVS	4
+#define ADDRESS_TYPE_PMEM	5
+
+#define LOONGSON3_BOOT_MEM_MAP_MAX 128
+
+#define LOONGSON_EFIBOOT_SIGNATURE	"BPI"
+#define LOONGSON_MEM_LINKLIST		"MEM"
+#define LOONGSON_VBIOS_LINKLIST		"VBIOS"
+#define LOONGSON_SCREENINFO_LINKLIST	"SINFO"
+
+/* Values for Version BPI */
+enum bpi_version {
+	BPI_VERSION_V1 = 1000, /* Signature="BPI01000" */
+	BPI_VERSION_V2 = 1001, /* Signature="BPI01001" */
+};
+
+/* Flags in bootparamsinterface */
+#define BPI_FLAGS_UEFI_SUPPORTED BIT(0)
+
+struct _extention_list_hdr {
+	u64	signature;
+	u32	length;
+	u8	revision;
+	u8	checksum;
+	struct	_extention_list_hdr *next;
+} __packed;
+
+struct bootparamsinterface {
+	u64	signature;	/* {"B", "P", "I", "0", "1", ... } */
+	void	*systemtable;
+	struct	_extention_list_hdr *extlist;
+	u64	flags;
+} __packed;
+
+struct loongsonlist_mem_map {
+	struct	_extention_list_hdr header;	/* {"M", "E", "M"} */
+	u8	map_count;
+	struct	loongson_mem_map {
+		u32 mem_type;
+		u64 mem_start;
+		u64 mem_size;
+	} __packed map[LOONGSON3_BOOT_MEM_MAP_MAX];
+} __packed;
+
+struct loongsonlist_vbios {
+	struct	_extention_list_hdr header;	/* {"V", "B", "I", "O", "S"} */
+	u64	vbios_addr;
+} __packed;
+
+struct loongsonlist_screeninfo {
+	struct	_extention_list_hdr header;	/* {"S", "I", "N", "F", "O"} */
+	//struct	screen_info si;
+} __packed;
+
+struct loongson_board_info {
+	int bios_size;
+	char *bios_vendor;
+	char *bios_version;
+	char *bios_release_date;
+	char *board_name;
+	char *board_vendor;
+};
+
+struct loongson_system_configuration {
+	int bpi_ver;
+	int nr_cpus;
+	int nr_nodes;
+	int nr_io_pics;
+	int boot_cpu_id;
+	int cores_per_node;
+	int cores_per_package;
+	char *cpuname;
+	u64 vgabios_addr;
+};
+
+extern struct loongson_board_info b_info;
+extern struct bootparamsinterface *efi_bp;
+extern struct loongsonlist_mem_map *loongson_mem_map;
+extern struct loongson_system_configuration loongson_sysconf;
+#endif

mini_kernel4/extioi.c

@@ -0,0 +1,28 @@
+#include "loongarch.h"
+#include "ls7a.h"
+
+void extioi_init(void)
+{
+    iocsr_writeq((0x1UL << UART0_IRQ) | (0x1UL << KEYBOARD_IRQ) | 
+                 (0x1UL << MOUSE_IRQ), LOONGARCH_IOCSR_EXTIOI_EN_BASE);  
+
+    /* extioi[31:0] map to cpu irq pin INT1, other to INT0 */
+    iocsr_writeq(0x01UL,LOONGARCH_IOCSR_EXTIOI_MAP_BASE);
+
+    /* extioi IRQ 0-7 route to core 0, use node type 0 */
+    iocsr_writeq(0x0UL,LOONGARCH_IOCSR_EXTIOI_ROUTE_BASE);
+
+    /* nodetype0 set to 1, always trigger at node 0 */
+    iocsr_writeq(0x1,LOONGARCH_IOCSR_EXRIOI_NODETYPE_BASE);
+}
+
+// ask the extioi what interrupt we should serve.
+unsigned long extioi_claim(void)
+{
+    return iocsr_readq(LOONGARCH_IOCSR_EXTIOI_ISR_BASE);
+}
+
+void extioi_complete(unsigned long irq)
+{
+    iocsr_writeq(irq, LOONGARCH_IOCSR_EXTIOI_ISR_BASE);
+}

mini_kernel4/hello_kernel.c

@@ -0,0 +1,28 @@
+/* minimal kernel for loongarch64
+ * it print out information passed by BIOS
+ */
+#include "lib.h"
+#include "boot_param.h"
+
+extern void trap_init(void);
+
+void kernel_entry(int a0, char **args, struct bootparamsinterface *a2)
+{
+    int i;
+
+    printf("There is %d args for kernel:\n", a0);
+    for (i=0; i < a0; i++) {
+        printf("cmd arg %d: %s\n", i, args[i]);
+    }
+
+    printf("efi system table at %p\n", a2->systemtable);
+    printf("efi extend list at %p\n", a2->extlist);
+
+    /* ... read the linux kernel source for how to decode these data */
+
+    trap_init();
+
+    while(1);
+}
+
+