From 6960c1ccba46373780355b6f444078a751d48b54 Mon Sep 17 00:00:00 2001
From: Zihao Yu <yuzihao@ict.ac.cn>
Date: Tue, 10 Mar 2020 17:13:30 +0800
Subject: [PATCH] add x86-sdi

---
 am/arch/x86-sdi.mk            | 32 +++++++++++++++++++++
 am/include/arch/x86-sdi.h     |  1 +
 am/src/sdi/include/nemu.h     | 53 +++++++++++++++++++++++++++++++++++
 am/src/sdi/ldscript/loader.ld |  7 +++++
 am/src/sdi/trm.c              | 25 +++++++++++++++++
 5 files changed, 118 insertions(+)
 create mode 100644 am/arch/x86-sdi.mk
 create mode 100644 am/include/arch/x86-sdi.h
 create mode 100644 am/src/sdi/include/nemu.h
 create mode 100644 am/src/sdi/ldscript/loader.ld
 create mode 100644 am/src/sdi/trm.c

diff --git a/am/arch/x86-sdi.mk b/am/arch/x86-sdi.mk
new file mode 100644
index 00000000..5cf6777a
--- /dev/null
+++ b/am/arch/x86-sdi.mk
@@ -0,0 +1,32 @@
+include $(AM_HOME)/am/arch/isa/x86.mk
+
+AM_SRCS += sdi/trm.c \
+           nemu/common/mainargs.S \
+           nemu/isa/x86/boot/start.S \
+           nemu/common/ioe.c \
+           nemu/common/input.c \
+           nemu/common/timer.c \
+           nemu/common/video.c \
+           dummy/mpe.c \
+
+CFLAGS  += -mstringop-strategy=loop -I$(AM_HOME)/am/src/sdi/include
+ASFLAGS += -DMAINARGS=\"$(mainargs)\"
+.PHONY: $(AM_HOME)/am/src/nemu/common/mainargs.S
+
+LDFLAGS += -L $(AM_HOME)/am/src/nemu/ldscript
+LDFLAGS += -T $(AM_HOME)/am/src/sdi/ldscript/loader.ld
+
+NEMU_ARGS = --batch --log=$(shell dirname $(BINARY))/nemu-log.txt $(BINARY).bin
+
+image:
+	@echo + LD "->" $(BINARY_REL).elf
+	@$(LD) $(LDFLAGS) --gc-sections -o $(BINARY).elf $(LINK_FILES)
+	@$(OBJDUMP) -d $(BINARY).elf > $(BINARY).txt
+	@echo + OBJCOPY "->" $(BINARY_REL).bin
+	@$(OBJCOPY) -S --set-section-flags .bss=alloc,contents -O binary $(BINARY).elf $(BINARY).bin
+
+run:
+	$(MAKE) -C $(NEMU_HOME) ISA=$(ISA) run ARGS="$(NEMU_ARGS)"
+
+gdb: image
+	$(MAKE) -C $(NEMU_HOME) ISA=$(ISA) gdb ARGS="$(NEMU_ARGS)"
diff --git a/am/include/arch/x86-sdi.h b/am/include/arch/x86-sdi.h
new file mode 100644
index 00000000..a45d58ba
--- /dev/null
+++ b/am/include/arch/x86-sdi.h
@@ -0,0 +1 @@
+#include "x86-nemu.h"
diff --git a/am/src/sdi/include/nemu.h b/am/src/sdi/include/nemu.h
new file mode 100644
index 00000000..35e3aa33
--- /dev/null
+++ b/am/src/sdi/include/nemu.h
@@ -0,0 +1,53 @@
+#ifndef __NEMU_H__
+#define __NEMU_H__
+
+#include <klib-macros.h>
+
+# define SERIAL_PORT  0xa10003f8
+# define KBD_ADDR     0xa1000060
+# define RTC_ADDR     0xa1000048
+# define SCREEN_ADDR  0xa1000100
+# define SYNC_ADDR    0xa1000104
+# define FB_ADDR      0xa0000000
+
+#define MMIO_BASE 0xa0000000
+#define MMIO_SIZE 0x10000000
+
+static inline uint8_t  inb(uintptr_t addr) { return *(volatile uint8_t  *)addr; }
+static inline uint16_t inw(uintptr_t addr) { return *(volatile uint16_t *)addr; }
+static inline uint32_t inl(uintptr_t addr) { return *(volatile uint32_t *)addr; }
+
+static inline void outb(uintptr_t addr, uint8_t  data) { *(volatile uint8_t  *)addr = data; }
+static inline void outw(uintptr_t addr, uint16_t data) { *(volatile uint16_t *)addr = data; }
+static inline void outl(uintptr_t addr, uint32_t data) { *(volatile uint32_t *)addr = data; }
+
+extern char _pmem_start, _pmem_end;
+
+#define NEMU_PADDR_SPACE \
+  RANGE(&_pmem_start, &_pmem_end), \
+  RANGE(0xa0000000, 0xa0000000 + 0x80000), /* vmem */ \
+  RANGE(0xa1000000, 0xa1000000 + 0x1000)   /* serial, rtc, screen, keyboard */
+
+#define PGSIZE    4096
+#define PGSHFT    12      // log2(PGSIZE)
+#define PN(addr)    ((uintptr_t)(addr) >> PGSHFT)
+#define OFF(va)     ((uintptr_t)(va) & (PGSIZE - 1))
+
+typedef uintptr_t PTE;
+
+typedef struct {
+  int ptw_level;
+  int vpn_width;
+} ptw_config;
+
+// Offset of VPN[i] in a virtual address
+static inline int VPNiSHFT(const ptw_config c, int i) {
+  return (PGSHFT) + c.vpn_width * i;
+}
+// Extract the VPN[i] field in a virtual address
+static inline uintptr_t VPNi(const ptw_config c, uintptr_t va, int i) {
+  uintptr_t vpn_mask = (1 << c.vpn_width) - 1;
+  return (va >> VPNiSHFT(c, i)) & vpn_mask;
+}
+
+#endif
diff --git a/am/src/sdi/ldscript/loader.ld b/am/src/sdi/ldscript/loader.ld
new file mode 100644
index 00000000..cf8ac10d
--- /dev/null
+++ b/am/src/sdi/ldscript/loader.ld
@@ -0,0 +1,7 @@
+pmem_base = 0x0;
+
+MEMORY {
+  ram (rwxa) : ORIGIN = 0x0, LENGTH = 128M
+}
+
+INCLUDE "section.ld"
diff --git a/am/src/sdi/trm.c b/am/src/sdi/trm.c
new file mode 100644
index 00000000..d05baaec
--- /dev/null
+++ b/am/src/sdi/trm.c
@@ -0,0 +1,25 @@
+#include <am.h>
+#include <klib.h>
+#include <klib-macros.h>
+#include <nemu.h>
+
+extern char _heap_start;
+int main(const char *args);
+
+_Area _heap = RANGE(&_heap_start, &_pmem_end);
+
+void _trm_init() {
+  extern const char __am_mainargs;
+  int ret = main(&__am_mainargs);
+  _halt(ret);
+}
+
+void _putc(char ch) {
+  outb(SERIAL_PORT, ch);
+}
+
+void _halt(int code) {
+  printf("Exit with code = %d\n", code);
+  printf("Spinning\n");
+  while (1);
+}