reorganize file structure to match the upstream requirements

1 files changed, 115 insertions, 0 deletions

diff --git a/threads/io.h b/threads/io.h
new file mode 100644
index 0000000..30d52da
--- /dev/null
+++ b/threads/io.h
@@ -0,0 +1,115 @@
+#ifndef THREADS_IO_H
+#define THREADS_IO_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* Reads and returns a byte from PORT. */
+static inline uint8_t
+inb (uint16_t port)
+{
+  /* See [IA32-v2a] "IN". */
+  uint8_t data;
+  asm volatile ("inb %w1, %b0" : "=a" (data) : "Nd" (port));
+  return data;
+}
+
+/* Reads CNT bytes from PORT, one after another, and stores them
+   into the buffer starting at ADDR. */
+static inline void
+insb (uint16_t port, void *addr, size_t cnt)
+{
+  /* See [IA32-v2a] "INS". */
+  asm volatile ("rep insb" : "+D" (addr), "+c" (cnt) : "d" (port) : "memory");
+}
+
+/* Reads and returns 16 bits from PORT. */
+static inline uint16_t
+inw (uint16_t port)
+{
+  uint16_t data;
+  /* See [IA32-v2a] "IN". */
+  asm volatile ("inw %w1, %w0" : "=a" (data) : "Nd" (port));
+  return data;
+}
+
+/* Reads CNT 16-bit (halfword) units from PORT, one after
+   another, and stores them into the buffer starting at ADDR. */
+static inline void
+insw (uint16_t port, void *addr, size_t cnt)
+{
+  /* See [IA32-v2a] "INS". */
+  asm volatile ("rep insw" : "+D" (addr), "+c" (cnt) : "d" (port) : "memory");
+}
+
+/* Reads and returns 32 bits from PORT. */
+static inline uint32_t
+inl (uint16_t port)
+{
+  /* See [IA32-v2a] "IN". */
+  uint32_t data;
+  asm volatile ("inl %w1, %0" : "=a" (data) : "Nd" (port));
+  return data;
+}
+
+/* Reads CNT 32-bit (word) units from PORT, one after another,
+   and stores them into the buffer starting at ADDR. */
+static inline void
+insl (uint16_t port, void *addr, size_t cnt)
+{
+  /* See [IA32-v2a] "INS". */
+  asm volatile ("rep insl" : "+D" (addr), "+c" (cnt) : "d" (port) : "memory");
+}
+
+/* Writes byte DATA to PORT. */
+static inline void
+outb (uint16_t port, uint8_t data)
+{
+  /* See [IA32-v2b] "OUT". */
+  asm volatile ("outb %b0, %w1" : : "a" (data), "Nd" (port));
+}
+
+/* Writes to PORT each byte of data in the CNT-byte buffer
+   starting at ADDR. */
+static inline void
+outsb (uint16_t port, const void *addr, size_t cnt)
+{
+  /* See [IA32-v2b] "OUTS". */
+  asm volatile ("rep outsb" : "+S" (addr), "+c" (cnt) : "d" (port));
+}
+
+/* Writes the 16-bit DATA to PORT. */
+static inline void
+outw (uint16_t port, uint16_t data)
+{
+  /* See [IA32-v2b] "OUT". */
+  asm volatile ("outw %w0, %w1" : : "a" (data), "Nd" (port));
+}
+
+/* Writes to PORT each 16-bit unit (halfword) of data in the
+   CNT-halfword buffer starting at ADDR. */
+static inline void
+outsw (uint16_t port, const void *addr, size_t cnt)
+{
+  /* See [IA32-v2b] "OUTS". */
+  asm volatile ("rep outsw" : "+S" (addr), "+c" (cnt) : "d" (port));
+}
+
+/* Writes the 32-bit DATA to PORT. */
+static inline void
+outl (uint16_t port, uint32_t data)
+{
+  /* See [IA32-v2b] "OUT". */
+  asm volatile ("outl %0, %w1" : : "a" (data), "Nd" (port));
+}
+
+/* Writes to PORT each 32-bit unit (word) of data in the CNT-word
+   buffer starting at ADDR. */
+static inline void
+outsl (uint16_t port, const void *addr, size_t cnt)
+{
+  /* See [IA32-v2b] "OUTS". */
+  asm volatile ("rep outsl" : "+S" (addr), "+c" (cnt) : "d" (port));
+}
+
+#endif /* threads/io.h */