patch-2.3.43 linux/arch/ia64/ia32/ia32_support.c

• Lines: 62
• Date: Tue Feb 8 12:01:59 2000
• Orig file: v2.3.42/linux/arch/ia64/ia32/ia32_support.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/arch/ia64/ia32/ia32_support.c linux/arch/ia64/ia32/ia32_support.c
@@ -0,0 +1,61 @@
+/*
+ * IA32 helper functions
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/ia32.h>
+
+extern unsigned long *ia32_gdt_table, *ia32_tss;
+
+extern void die_if_kernel (char *str, struct pt_regs *regs, long err);
+
+/*
+ * Setup IA32 GDT and TSS 
+ */
+void
+ia32_gdt_init(void)
+{
+	unsigned long gdt_and_tss_page;
+
+	/* allocate two IA-32 pages of memory: */
+	gdt_and_tss_page = __get_free_pages(GFP_KERNEL,
+					    (IA32_PAGE_SHIFT < PAGE_SHIFT)
+					    ? 0 : (IA32_PAGE_SHIFT + 1) - PAGE_SHIFT);
+	ia32_gdt_table = (unsigned long *) gdt_and_tss_page;
+	ia32_tss = (unsigned long *) (gdt_and_tss_page + IA32_PAGE_SIZE);
+
+	/* Zero the gdt and tss */
+	memset((void *) gdt_and_tss_page, 0, 2*IA32_PAGE_SIZE);
+
+	/* CS descriptor in IA-32 format */
+	ia32_gdt_table[4] = IA32_SEG_DESCRIPTOR(0L, 0xBFFFFFFFL, 0xBL, 1L,
+						3L, 1L, 1L, 1L, 1L);
+
+	/* DS descriptor in IA-32 format */
+	ia32_gdt_table[5] = IA32_SEG_DESCRIPTOR(0L, 0xBFFFFFFFL, 0x3L, 1L,
+						3L, 1L, 1L, 1L, 1L);
+}
+
+/*
+ * Handle bad IA32 interrupt via syscall 
+ */
+void
+ia32_bad_interrupt (unsigned long int_num, struct pt_regs *regs)
+{
+	siginfo_t siginfo;
+
+	die_if_kernel("Bad IA-32 interrupt", regs, int_num);
+
+	siginfo.si_signo = SIGTRAP;
+	siginfo.si_errno = int_num;	/* XXX is it legal to abuse si_errno like this? */
+	siginfo.si_code = TRAP_BRKPT;
+	force_sig_info(SIGTRAP, &siginfo, current);
+}
+