move to monorepo

+ Will probably have to make some changes to dir layout to make things
  make more sense

7 files changed, 133 insertions, 0 deletions

diff --git a/triscv/include/triscv/common.h b/triscv/include/triscv/common.h
new file mode 100644
index 0000000..865f6e5
--- /dev/null
+++ b/triscv/include/triscv/common.h
@@ -0,0 +1,28 @@
+#ifndef TRISCV_COMMON_H
+#define TRISCV_COMMON_H
+
+#include <tri.h>
+#include <stdint.h>
+
+typedef uint64_t vm_t;
+typedef uint64_t pm_t;
+
+/* forward declarations */
+struct cpu;
+struct tmb;
+struct mmu;
+struct mem;
+struct uart;
+
+enum stat {
+	OK = 0,
+	ERR_FULL,
+	ERR_EXISTS,
+	ERR_OOB,
+};
+
+typedef enum stat stat_t;
+
+const char *err_str(stat_t s);
+
+#endif
diff --git a/triscv/include/triscv/cpu.h b/triscv/include/triscv/cpu.h
new file mode 100644
index 0000000..05f8b78
--- /dev/null
+++ b/triscv/include/triscv/cpu.h
@@ -0,0 +1,14 @@
+#ifndef TRISCV_CPU_H
+#define TRISCV_CPU_H
+
+#include <triscv/common.h>
+
+struct cpu *cpu_create(struct mmu *mmu, struct tmb *tmb);
+void cpu_reset(struct cpu *cpu);
+void cpu_destroy(struct cpu *cpu);
+
+/** @todo how should external interrupts be handled? add some list of devices to
+ * update after each cycle? */
+void cpu_run(struct cpu *cpu, vm_t start);
+
+#endif
diff --git a/triscv/include/triscv/csr.h b/triscv/include/triscv/csr.h
new file mode 100644
index 0000000..a805702
--- /dev/null
+++ b/triscv/include/triscv/csr.h
@@ -0,0 +1,8 @@
+#ifndef TRISCV_CSR_H
+#define TRISCV_CSR_H
+
+/* first trit is sleep mode, R/W, second trit shutdown, R/W */
+#define CSR_MPOWER 0
+#define RW_MPOWER  0b1111
+
+#endif
diff --git a/triscv/include/triscv/mem.h b/triscv/include/triscv/mem.h
new file mode 100644
index 0000000..81b5d11
--- /dev/null
+++ b/triscv/include/triscv/mem.h
@@ -0,0 +1,13 @@
+#ifndef TRISCV_MEM_H
+#define TRISCV_MEM_H
+
+#include <triscv/common.h>
+#include <triscv/mmu.h>
+
+struct mem *mem_create(size_t size);
+void mem_destroy(struct mem *mem);
+void mem_init(struct mem *mem, const void *buf, size_t len);
+
+struct dev mem_dev(struct mem *mem);
+
+#endif
diff --git a/triscv/include/triscv/mmu.h b/triscv/include/triscv/mmu.h
new file mode 100644
index 0000000..c885814
--- /dev/null
+++ b/triscv/include/triscv/mmu.h
@@ -0,0 +1,40 @@
+#ifndef TRISCV_MMU_H
+#define TRISCV_MMU_H
+
+#include <triscv/common.h>
+#include <triscv/cpu.h>
+
+typedef void (*dev_write1_t)(struct cpu *cpu, void *dev, pm_t addr, tri_t t);
+typedef void (*dev_write3_t)(struct cpu *cpu, void *dev, pm_t addr, tri_t t);
+typedef tri_t (*dev_read1_t)(struct cpu *cpu, void *dev, pm_t addr);
+typedef tri_t (*dev_read3_t)(struct cpu *cpu, void *dev, pm_t addr);
+
+/* only character devices for now */
+struct dev {
+	void *dev;
+	size_t size;
+	dev_write1_t write1;
+	dev_write3_t write3;
+	dev_read1_t read1;
+	dev_read3_t read3;
+};
+
+struct mmu *mmu_create();
+void mmu_destroy(struct mmu *mmu);
+
+/* not thread safe */
+stat_t mmu_map_dev(struct mmu *mmu, pm_t start, struct dev dev);
+
+void mmu_enable(struct mmu *mmu);
+void mmu_disable(struct mmu *mmu);
+
+bool mmu_valid(struct mmu *mmu, vm_t addr);
+
+/* mmu can raise signals, so we pass cpu along */
+tri_t mmu_read1(struct cpu *cpu, struct mmu *mmu, vm_t addr);
+tri_t mmu_read3(struct cpu *cpu, struct mmu *mmu, vm_t addr);
+
+void mmu_write1(struct cpu *cpu, struct mmu *mmu, vm_t addr, tri_t t);
+void mmu_write3(struct cpu *cpu, struct mmu *mmu, vm_t addr, tri_t t);
+
+#endif
diff --git a/triscv/include/triscv/tmb.h b/triscv/include/triscv/tmb.h
new file mode 100644
index 0000000..0c8a5b6
--- /dev/null
+++ b/triscv/include/triscv/tmb.h
@@ -0,0 +1,18 @@
+#ifndef TRISCV_TMB_H
+#define TRISCV_TMB_H
+
+#include <triscv/common.h>
+#include <triscv/cpu.h>
+
+struct tmb *tmb_create();
+void tmb_destroy(struct tmb *tmb);
+
+size_t tmb_size(struct cpu *cpu);
+
+void tmb_clear(struct cpu *cpu);
+void tmb_cancel(struct cpu *cpu);
+void tmb_store1(struct cpu *cpu, vm_t addr, tri_t t);
+void tmb_store3(struct cpu *cpu, vm_t addr, tri_t t);
+bool tmb_commit(struct cpu *cpu);
+
+#endif
diff --git a/triscv/include/triscv/uart.h b/triscv/include/triscv/uart.h
new file mode 100644
index 0000000..531da1d
--- /dev/null
+++ b/triscv/include/triscv/uart.h
@@ -0,0 +1,12 @@
+#ifndef TRISCV_UART_H
+#define TRISCV_UART_H
+
+#include <triscv/common.h>
+#include <triscv/mmu.h>
+
+struct uart *uart_create();
+void uart_destroy(struct uart *uart);
+
+struct dev uart_dev(struct uart *uart);
+
+#endif