mmu lowerhalf enabled

Author: ComradeProgrammer

.vscode/ipch/41dae028f18889eb/el.ipch

@@ -0,0 +1,37 @@
+drivers_dir   := drivers
+boot_dir      := boot
+init_dir      := init
+lib_dir       := lib
+mm_dir        := mm
+vmlinux_elf   := kernel.elf
+vmlinux_img   := kernel8.img
+link_script   := kernel.lds
+
+modules       := boot drivers init lib
+objects       := $(boot_dir)/*.o \
+                 $(init_dir)/*.o \
+                 $(drivers_dir)/rpi3/*.o \
+                 $(lib_dir)/*.o
+
+.PHONY: all $(modules) clean debug run
+
+all: $(modules) vmlinux
+
+vmlinux: $(modules)
+	$(LD) -o $(vmlinux_elf) -T$(link_script) $(objects)
+	$(CROSS_COMPILE)objcopy $(vmlinux_elf) -O binary $(vmlinux_img)
+
+$(modules):
+	$(MAKE) --directory=$@
+
+clean:
+	for d in $(modules); \
+		do \
+			$(MAKE) --directory=$$d clean; \
+		done; \
+	rm -rf *.o *~ $(vmlinux_elf) $(vmlinux_img)
+run:
+	qemu-system-aarch64 -M raspi3 -serial stdio -kernel kernel8.img
+debug:
+	qemu-system-aarch64 -S -s -M raspi3 -serial stdio -kernel kernel8.img
+include include.mk

.vscode/ipch/41dae028f18889eb/mmap_address.bin

@@ -0,0 +1,16 @@
+INCLUDES := -I./ -I../ -I../include/
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(INCLUDES) -c $<
+
+%.o: %.S
+	$(CC) $(CFLAGS) $(INCLUDES) -c $<
+
+.PHONY: clean
+
+all: start.o
+
+clean:
+	rm -rf *~ *.o
+
+include ../include.mk

.vscode/ipch/4557ef1389267607/main.ipch

@@ -0,0 +1,81 @@
+.global _start
+
+.section ".text.boot"
+_start:
+    mrs x0, mpidr_el1
+    and x0, x0, #3 // & 0b11
+    cbz x0, _start_master
+1:  wfe
+    b 1b
+
+_start_master:
+    ldr     x1, =_start
+ // set up EL1
+    mrs     x0, CurrentEL
+    and     x0, x0, #12 // clear reserved bits
+
+    // running at EL3?
+    cmp     x0, #12
+    bne     5f
+    // should never be executed, just for completeness
+    mov     x2, #0x5b1
+    msr     scr_el3, x2
+    mov     x2, #0x3c9
+    msr     spsr_el3, x2
+    adr     x2, 5f
+    msr     elr_el3, x2
+    eret
+
+    // running at EL2?
+5:  cmp     x0, #4
+    beq     5f
+    msr     sp_el1, x1
+    // enable CNTP for EL1
+    /*it seems that this part is unnecessary in lab1
+    and from the reference,P2172,it seems that this code can give the access 
+    to some registers from el1?*/
+    mrs     x0, cnthctl_el2 
+    orr     x0, x0, #3
+    msr     cnthctl_el2, x0
+    msr     cntvoff_el2, xzr
+
+    // disable coprocessor traps
+    mov     x0, #0x33FF
+    msr     cptr_el2, x0    //essential! give access to SIMD,see reference 1891
+    msr     hstr_el2, xzr //seems not so useful. reference P1931
+    mov     x0, #(0xf << 20)//essential! give access to SIMD,see reference 3808
+    msr     cpacr_el1, x0
+    // enable AArch64 in EL1
+    mov     x0, #(1 << 31)      // set to AArch64
+    orr     x0, x0, #(1 << 1)   // SWIO hardwired on Pi3,Reference 1928 ???
+    msr     hcr_el2, x0
+    mrs     x0, hcr_el2
+    // Setup SCTLR access
+    mov     x2, #0x0800
+    movk    x2, #0x30d0, lsl #16//MOVK :move with keep
+    msr     sctlr_el1, x2
+    // set up exception handlers
+    //ldr     x2, =_vectors
+    //msr     vbar_el1, x2
+    // change execution level to EL1
+    mov     x2, #0x3c4
+    msr     spsr_el2, x2
+    adr     x2, 5f
+    msr     elr_el2, x2
+    eret
+
+5:  //mov     sp, x1
+
+    // clear bss
+    ldr     x1, =__bss_start
+    ldr     w2, =__bss_size
+3:  cbz     w2, 4f
+    str     xzr, [x1], #8
+    sub     w2, w2, #1
+    cbnz    w2, 3b
+
+    ldr x0, =0x80000
+    mov sp, x0
+4:
+    bl main
+    b 1b

.vscode/ipch/4557ef1389267607/mmap_address.bin

@@ -0,0 +1,17 @@
+drivers := rpi3
+
+.PHONY: all $(drivers) clean
+
+all: $(drivers)
+
+$(drivers):
+	$(MAKE) --directory=$@
+
+clean: 
+	for d in $(drivers); \
+		do				\
+			$(MAKE) --directory=$$d clean; \
+		done
+
+
+include ../include.mk

.vscode/ipch/70fb9b2636423b75/mmap_address.bin

@@ -0,0 +1,11 @@
+%.o: %.c %.h
+	$(CC) $(CFLAGS) -c $< -o $*.o
+
+.PHONY: all clean
+
+all: uart_boot.o
+
+clean:
+	rm -rf *.o *~
+
+include ../../include.mk

.vscode/ipch/70fb9b2636423b75/print.ipch

@@ -0,0 +1,44 @@
+
+void uart_init_boot() {
+#define UART0_IBRD      ((volatile unsigned int*)(0x3F201024))
+#define UART0_FBRD      ((volatile unsigned int*)(0x3F201028))
+#define UART0_LCRH      ((volatile unsigned int*)(0x3F20102C))
+#define UART0_CR        ((volatile unsigned int*)(0x3F201030))
+#define UART0_ICR       ((volatile unsigned int*)(0x3F201044))
+#define GPFSEL1         ((volatile unsigned int*)(0x3F200004))
+#define GPPUD           ((volatile unsigned int*)(0x3F200094))
+#define GPPUDCLK0       ((volatile unsigned int*)(0x3F200098))
+#define UART0_DR        ((volatile unsigned int*)(0x3F201000))
+#define UART0_FR        ((volatile unsigned int*)(0x3F201018))
+    register unsigned int r;
+    *UART0_CR = 0;
+    r = *GPFSEL1;
+    r &= ~((7 << 12) | (7 << 15)); // gpio14, gpio15
+    r |= (4 << 12) | (4 << 15);    // alt0
+    *GPFSEL1 = r;
+    *GPPUD = 0;            // enable pins 14 and 15
+    r = 150;
+    while (r--) { asm volatile("nop"); }
+    *GPPUDCLK0 = (1 << 14) | (1 << 15);
+    r = 150;
+    while (r--) { asm volatile("nop"); }
+    *GPPUDCLK0 = 0;        // flush GPIO setup
+    *UART0_ICR = 0x7FF;    // clear interrupts
+    *UART0_IBRD = 2;       // 115200 baud
+    *UART0_FBRD = 0xB;
+    *UART0_LCRH = 0b11 << 5; // 8n1
+    *UART0_CR = 0x301;     // enable Tx, Rx, FIFO
+}
+
+void uart_send_boot(unsigned int c) {
+    do { asm volatile("nop"); } while (*UART0_FR & 0x20);
+    *UART0_DR = c;
+}
+
+
+char uart_getc_boot() {
+    char r;
+    do { asm volatile("nop"); } while (*UART0_FR & 0x10);
+    r = (char)(*UART0_DR);
+    return r == '\r' ? '\n' : r;
+}

.vscode/ipch/a04ba05e9961764d/mmap_address.bin

@@ -0,0 +1,22 @@
+modify the Makefile.Add -g to the arguements 
+step1: in one terminal,
+    make debug
+step2: in another terminal, 
+    aarch64-elf-gdb kernel.elf
+step3:(in gdb)
+    target remote localhost:1234
+step4:
+    break *0x80000
+    continue
+till now ,we have reach the start of the kernel.
+we have two kinds of debug methods:assemble and c
+
+c method:
+layout src //show the c original code
+step: one step forward(enter function)
+next: one step(won't enter function)
+
+assemble method:
+layout asm// show asm code
+si one step forward(enter function)
+ni: one step(won't enter function)

.vscode/ipch/a04ba05e9961764d/mmu.ipch

@@ -0,0 +1,4 @@
+CROSS_COMPILE   := aarch64-elf-
+CC              := $(CROSS_COMPILE)gcc
+CFLAGS          := -Wall -ffreestanding -g
+LD              := $(CROSS_COMPILE)ld

.vscode/ipch/cded2fecd125a68f/mmap_address.bin

@@ -0,0 +1,44 @@
+#ifndef _mmu_h
+#define _mmu_h
+
+extern char _end[]; 
+extern char _start[];
+extern char _pg_dir[]; 
+extern volatile unsigned char _data[];
+//memory class
+#define PTE_NORMAL (0<<2)
+#define PTE_DEVICE (1 << 2)
+#define PTE_NON_CACHE (2 << 2)
+
+#define TCR_T0SZ			(64 - 48) 
+#define TCR_T1SZ			((64 - 48) << 16)
+#define TCR_TG0_4K			(0 << 14)
+#define TCR_TG1_4K			(2 << 30)
+#define TCR_VALUE			(TCR_T0SZ | TCR_T1SZ | TCR_TG0_4K | TCR_TG1_4K)
+
+#define BY2PG 4096
+#define MEM_SIZE 0x40000000
+
+#define TYPE_PAGE 0x3
+#define TYPE_BLOCK 0x1
+#define MM_ACCESS_PERMISSION	(0x01 << 6) 
+#define PTE_V 0x1
+#define PTE_AF			(0x1 << 10)
+#define PTE_RO		(0x1 << 7)
+#define PTE_USER (0x1<<6)
+
+#define PTE_OSH      (2<<8)      // outter shareable
+#define PTE_ISH      (3<<8)      // inner shareable
+
+#define KERNEL_BASE 0xffff000000000000
+/* Rounding; only works for n = power of two */
+#define ROUND(a, n)	(((((unsigned long)(a))+(n)-1)) & ~((n)-1))
+#define ROUNDDOWN(a, n)	(((unsigned long)(a)) & ~((n)-1))
+
+#define PGDX(va) ((((unsigned long)(va))>>39)&0x1ff)
+#define PUDX(va) ((((unsigned long)(va))>>30)&0x1ff)
+#define PMDX(va) ((((unsigned long)(va))>>21)&0x1ff)
+#define PTEX(va) ((((unsigned long)(va))>>12)&0x1ff)
+
+
+#endif

.vscode/ipch/cded2fecd125a68f/printf.ipch

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2001 MontaVista Software Inc.
+ * Author: Jun Sun, [email protected] or [email protected]
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#ifndef _print_h_
+#define _print_h_
+
+#include <stdarg.h>
+
+/* this is the maximum width for a variable */
+#define		LP_MAX_BUF	1000
+
+/* -*-
+ * output function takes an void pointer which is passed in as the
+ * second argument in lp_Print().  This black-box argument gives output
+ * function a way to track state.
+ *
+ * The second argument in output function is a pointer to char buffer.
+ * The third argument specifies the number of chars to outputed.
+ *
+ * output function cannot assume the buffer is null-terminated after
+ * l number of chars.
+ */
+void lp_Print(void (*output)(void *, char *, int),
+              void * arg,
+              char *fmt,
+              va_list ap);
+
+#endif

.vscode/ipch/f57f9b7b203a8d96/mmap_address.bin

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2001 MontaVista Software Inc.
+ * Author: Jun Sun, [email protected] or [email protected]
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#ifndef _printf_h_
+#define _printf_h_
+
+#include <stdarg.h>
+void printf(char *fmt, ...);
+
+void _panic(const char *, int, const char *, ...)
+__attribute__((noreturn));
+
+#define panic(...) _panic(__FILE__, __LINE__, __VA_ARGS__)
+
+#endif /* _printf_h_ */

.vscode/ipch/f57f9b7b203a8d96/printel.ipch

@@ -0,0 +1,38 @@
+#ifndef _INC_TYPES_H_
+#define _INC_TYPES_H_
+
+typedef signed short              int16_t;
+typedef unsigned short          u_int16_t;
+typedef signed int                int32_t;
+typedef unsigned int            u_int32_t;
+typedef signed long               int64_t;
+typedef unsigned long           u_int64_t;
+
+typedef unsigned char           u_char;
+typedef unsigned short          u_short;
+typedef unsigned int            u_int;
+typedef unsigned long           u_long;
+
+typedef unsigned long long      size_t;
+
+#ifndef NULL
+#define NULL ((void *) 0)
+#endif /* !NULL */
+
+#define MIN(_a, _b)	\
+	({		\
+		typeof(_a) __a = (_a);	\
+		typeof(_b) __b = (_b);	\
+		__a <= __b ? __a : __b;	\
+	})
+
+/* Static assert, for compile-time assertion checking */
+#define static_assert(c) switch (c) case 0: case(c):
+
+#define offsetof(type, member)  ((size_t)(&((type *)0)->member))
+
+/* Rounding; only works for n = power of two */
+#define ROUND(a, n)	(((((u_long)(a))+(n)-1)) & ~((n)-1))
+#define ROUNDDOWN(a, n)	(((u_long)(a)) & ~((n)-1))
+
+#endif /* !_INC_TYPES_H_ */