From f95a4a932476be2ba99e2fd081e8d2bc6ea12813 Mon Sep 17 00:00:00 2001 From: PikalaxALT Date: Fri, 15 Dec 2017 09:38:53 -0500 Subject: Import newlib and create makefile --- newlib/libc/sys/go32/go32func.c | 69 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 newlib/libc/sys/go32/go32func.c (limited to 'newlib/libc/sys/go32/go32func.c') diff --git a/newlib/libc/sys/go32/go32func.c b/newlib/libc/sys/go32/go32func.c new file mode 100644 index 0000000..ec3853b --- /dev/null +++ b/newlib/libc/sys/go32/go32func.c @@ -0,0 +1,69 @@ +#include +#include "go32.h" +#include "dpmi.h" +#include "dos.h" + +u_short _go32_my_cs() +{ + asm("movw %cs,%ax"); +} + +u_short _go32_my_ds() +{ + asm("movw %ds,%ax"); +} + +u_short _go32_my_ss() +{ + asm("movw %ss,%ax"); +} + +u_short _go32_conventional_mem_selector() +{ + return _go32_info_block.selector_for_linear_memory; +} + +static _go32_dpmi_registers regs; +static volatile u_long ctrl_break_count = 0; +static int ctrl_break_hooked = 0; +static _go32_dpmi_seginfo old_vector; +static _go32_dpmi_seginfo new_vector; + +static ctrl_break_isr(_go32_dpmi_registers *regs) +{ + ctrl_break_count ++; +} + +u_long _go32_was_ctrl_break_hit() +{ + u_long cnt; + _go32_want_ctrl_break(1); + cnt = ctrl_break_count; + ctrl_break_count = 0; + return cnt; +} + +void _go32_want_ctrl_break(int yes) +{ + if (yes) + { + if (ctrl_break_hooked) + return; + _go32_dpmi_get_real_mode_interrupt_vector(0x1b, &old_vector); + + new_vector.pm_offset = (int)ctrl_break_isr; + _go32_dpmi_allocate_real_mode_callback_iret(&new_vector, ®s); + _go32_dpmi_set_real_mode_interrupt_vector(0x1b, &new_vector); + ctrl_break_count = 0; + ctrl_break_hooked = 1; + } + else + { + if (!ctrl_break_hooked) + return; + _go32_dpmi_set_real_mode_interrupt_vector(0x1b, &old_vector); + _go32_dpmi_free_real_mode_callback(&new_vector); + ctrl_break_count = 0; + ctrl_break_hooked = 0; + } +} -- cgit v1.2.3