feat: Initial PMM implementation

Introduce the foundational Physical Memory Manager (PMM) and restructure the project for modularity.
Implemented basic PMM and related memory management headers (mm/pmm.h, mm/vm.h).
Updated Makefile and build process to support new modular structure.

1 files changed, 0 insertions, 69 deletions

diff --git a/kernel.cc b/kernel.cc
deleted file mode 100644
index f9cacba..0000000
--- a/kernel.cc
+++ /dev/null
@@ -1,69 +0,0 @@
-extern "C" void kernel_main();
-
-#define UART_ADDR 0x10000000UL
-
-#define THR_OFFSET 0x0
-#define LSR_OFFSET 0x5
-#define FCR_OFFSET 0x2
-#define LCR_OFFSET 0x3
-#define DLL_OFFSET 0x0
-#define DLH_OFFSET 0x1
-
-static void
-write_byte(unsigned long addr, char byte)
-{
-    *((volatile char *)addr) = byte;
-}
-
-static int
-is_tx_empty()
-{
-    return *((volatile char *)(UART_ADDR + LSR_OFFSET)) & (1 << 5);
-}
-
-void uart_init()
-{
-    write_byte(UART_ADDR + LCR_OFFSET, 0x80);
-
-    write_byte(UART_ADDR + DLL_OFFSET, 0x01);
-    write_byte(UART_ADDR + DLH_OFFSET, 0x00);
-
-    write_byte(UART_ADDR + LCR_OFFSET, 0x03);
-
-    write_byte(UART_ADDR + FCR_OFFSET, 0x07);
-}
-
-void put_char(char c)
-{
-    if (c == '\n')
-    {
-        put_char('\r');
-    }
-
-    while (!is_tx_empty())
-    {
-    }
-    write_byte(UART_ADDR + THR_OFFSET, c);
-}
-
-void print_str(const char *s)
-{
-    while (*s != '\0')
-    {
-        put_char(*s++);
-    }
-}
-
-void kernel_main()
-{
-    uart_init();
-
-    print_str("Modern DOS 1.0\n");
-    print_str("Hello OS! Running on RISC-V 64.\n");
-    print_str("Hello Ziyi Yang! Love from RUC");
-
-    while (1)
-    {
-
-    }
-}
\ No newline at end of file