-// 16bit system callbacks
+// Handler for int 0x15 "system" calls
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
//
-// This file may be distributed under the terms of the GNU GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
-#include "util.h" // irq_restore
+#include "util.h" // memcpy_far
#include "biosvar.h" // BIOS_CONFIG_TABLE
#include "ioport.h" // inb
-
-#define E820_RAM 1
-#define E820_RESERVED 2
-#define E820_ACPI 3
-#define E820_NVS 4
-#define E820_UNUSABLE 5
+#include "memmap.h" // E820_RAM
+#include "pic.h" // eoi_pic2
+#include "bregs.h" // struct bregs
// Use PS2 System Control port A to set A20 enable
static inline u8
// get current setting first
u8 newval, oldval = inb(PORT_A20);
if (cond)
- newval = oldval | 0x02;
+ newval = oldval | A20_ENABLE_BIT;
else
- newval = oldval & ~0x02;
+ newval = oldval & ~A20_ENABLE_BIT;
outb(newval, PORT_A20);
- return (newval & 0x02) != 0;
+ return (oldval & A20_ENABLE_BIT) != 0;
}
static void
static void
handle_152402(struct bregs *regs)
{
- regs->al = !!(inb(PORT_A20) & 0x20);
+ regs->al = (inb(PORT_A20) & A20_ENABLE_BIT) != 0;
set_code_success(regs);
}
static void
handle_1524XX(struct bregs *regs)
{
- set_code_fail(regs, RET_EUNSUPPORTED);
+ set_code_unimplemented(regs, RET_EUNSUPPORTED);
}
static void
// 20..27 CS zeros filled in by BIOS
// 28..2f SS zeros filled in by BIOS
- //es:si
- //eeee0
- //0ssss
- //-----
-
// check for access rights of source & dest here
// Initialize GDT descriptor
- SET_SEG(ES, regs->es);
- u16 si = regs->si;
- u16 base15_00 = (regs->es << 4) + si;
- u16 base23_16 = regs->es >> 12;
- if (base15_00 < (u16)(regs->es<<4))
- base23_16++;
- SET_VAR(ES, *(u16*)(si+0x08+0), 47); // limit 15:00 = 6 * 8bytes/descriptor
- SET_VAR(ES, *(u16*)(si+0x08+2), base15_00);// base 15:00
- SET_VAR(ES, *(u8 *)(si+0x08+4), base23_16);// base 23:16
- SET_VAR(ES, *(u8 *)(si+0x08+5), 0x93); // access
- SET_VAR(ES, *(u16*)(si+0x08+6), 0x0000); // base 31:24/reserved/limit 19:16
-
+ u32 si = regs->si;
+ u64 *gdt_far = (void*)si;
+ u16 gdt_seg = regs->es;
+ u32 loc = (u32)MAKE_FLATPTR(gdt_seg, gdt_far);
+ SET_FARVAR(gdt_seg, gdt_far[1], GDT_DATA | GDT_LIMIT((6*sizeof(u64))-1)
+ | GDT_BASE(loc));
// Initialize CS descriptor
- SET_VAR(ES, *(u16*)(si+0x20+0), 0xffff);// limit 15:00 = normal 64K limit
- SET_VAR(ES, *(u16*)(si+0x20+2), 0x0000);// base 15:00
- SET_VAR(ES, *(u8 *)(si+0x20+4), 0x000f);// base 23:16
- SET_VAR(ES, *(u8 *)(si+0x20+5), 0x9b); // access
- SET_VAR(ES, *(u16*)(si+0x20+6), 0x0000);// base 31:24/reserved/limit 19:16
-
+ SET_FARVAR(gdt_seg, gdt_far[4], GDT_CODE | GDT_LIMIT(BUILD_BIOS_SIZE-1)
+ | GDT_BASE(BUILD_BIOS_ADDR));
// Initialize SS descriptor
- u16 ss = GET_SEG(SS);
- base15_00 = ss << 4;
- base23_16 = ss >> 12;
- SET_VAR(ES, *(u16*)(si+0x28+0), 0xffff); // limit 15:00 = normal 64K limit
- SET_VAR(ES, *(u16*)(si+0x28+2), base15_00);// base 15:00
- SET_VAR(ES, *(u8 *)(si+0x28+4), base23_16);// base 23:16
- SET_VAR(ES, *(u8 *)(si+0x28+5), 0x93); // access
- SET_VAR(ES, *(u16*)(si+0x28+6), 0x0000); // base 31:24/reserved/limit 19:16
+ loc = (u32)MAKE_FLATPTR(GET_SEG(SS), 0);
+ SET_FARVAR(gdt_seg, gdt_far[5], GDT_DATA | GDT_LIMIT(0x0ffff)
+ | GDT_BASE(loc));
u16 count = regs->cx;
asm volatile(
// Load new descriptor tables
- "lgdtw %%es:0x8(%%si)\n"
- "lidtw %%cs:pmode_IDT_info\n"
+ " lgdtw %%es:(1<<3)(%%si)\n"
+ " lidtw %%cs:pmode_IDT_info\n"
- // set PE bit in CR0
- "movl %%cr0, %%eax\n"
- "orb $0x01, %%al\n"
- "movl %%eax, %%cr0\n"
+ // Enable protected mode
+ " movl %%cr0, %%eax\n"
+ " orl $" __stringify(CR0_PE) ", %%eax\n"
+ " movl %%eax, %%cr0\n"
// far jump to flush CPU queue after transition to protected mode
- "ljmpw $0x0020, $1f\n"
- "1:\n"
+ " ljmpw $(4<<3), $1f\n"
// GDT points to valid descriptor table, now load DS, ES
- "movw $0x10, %%ax\n" // 010 000 = 2nd descriptor in table, TI=GDT, RPL=00
- "movw %%ax, %%ds\n"
- "movw $0x18, %%ax\n" // 011 000 = 3rd descriptor in table, TI=GDT, RPL=00
- "movw %%ax, %%es\n"
+ "1:movw $(2<<3), %%ax\n" // 2nd descriptor in table, TI=GDT, RPL=00
+ " movw %%ax, %%ds\n"
+ " movw $(3<<3), %%ax\n" // 3rd descriptor in table, TI=GDT, RPL=00
+ " movw %%ax, %%es\n"
// move CX words from DS:SI to ES:DI
- "xorw %%si, %%si\n"
- "xorw %%di, %%di\n"
- "rep movsw\n"
+ " xorw %%si, %%si\n"
+ " xorw %%di, %%di\n"
+ " rep movsw\n"
- // reset PG bit in CR0 ???
- "movl %%cr0, %%eax\n"
- "andb $0xfe, %%al\n"
- "movl %%eax, %%cr0\n"
+ // Restore DS and ES segment limits to 0xffff
+ " movw $(5<<3), %%ax\n" // 5th descriptor in table (SS)
+ " movw %%ax, %%ds\n"
+ " movw %%ax, %%es\n"
+
+ // Disable protected mode
+ " movl %%cr0, %%eax\n"
+ " andl $~" __stringify(CR0_PE) ", %%eax\n"
+ " movl %%eax, %%cr0\n"
// far jump to flush CPU queue after transition to real mode
- "ljmpw $0xf000, $2f\n"
- "2:\n"
+ " ljmpw $" __stringify(SEG_BIOS) ", $2f\n"
// restore IDT to normal real-mode defaults
- "lidt %%cs:rmode_IDT_info\n"
+ "2:lidtw %%cs:rmode_IDT_info\n"
// Restore %ds (from %ss)
- "movw %%ss, %%ax\n"
- "movw %%ax, %%ds\n"
+ " movw %%ss, %%ax\n"
+ " movw %%ax, %%ds\n"
: "+c"(count), "+S"(si)
: : "eax", "di", "cc"); // XXX - also clobbers %es
static void
handle_1588(struct bregs *regs)
{
- u32 rs = GET_EBDA(ram_size);
+ u32 rs = GET_GLOBAL(RamSize);
// According to Ralf Brown's interrupt the limit should be 15M,
// but real machines mostly return max. 63M.
set_success(regs);
}
+// Switch to protected mode
+static void
+handle_1589(struct bregs *regs)
+{
+ set_a20(1);
+
+ set_pics(regs->bl, regs->bh);
+
+ u64 *gdt_far = (void*)(regs->si + 0);
+ u16 gdt_seg = regs->es;
+ SET_FARVAR(gdt_seg, gdt_far[7], GDT_CODE | GDT_LIMIT(BUILD_BIOS_SIZE-1)
+ | GDT_BASE(BUILD_BIOS_ADDR));
+
+ regs->ds = 3<<3; // 3rd gdt descriptor is %ds
+ regs->es = 4<<3; // 4th gdt descriptor is %es
+ regs->code.seg = 6<<3; // 6th gdt descriptor is %cs
+
+ set_code_success(regs);
+
+ asm volatile(
+ // Load new descriptor tables
+ " lgdtw %%es:(1<<3)(%%si)\n"
+ " lidtw %%es:(2<<3)(%%si)\n"
+
+ // Enable protected mode
+ " movl %%cr0, %%eax\n"
+ " orl $" __stringify(CR0_PE) ", %%eax\n"
+ " movl %%eax, %%cr0\n"
+
+ // far jump to flush CPU queue after transition to protected mode
+ " ljmpw $(7<<3), $1f\n"
+
+ // GDT points to valid descriptor table, now load SS
+ "1:movw $(5<<3), %%ax\n"
+ " movw %%ax, %%ds\n"
+ " movw %%ax, %%ss\n"
+ :
+ : "S"(gdt_far)
+ : "eax", "cc");
+}
+
// Device busy interrupt. Called by Int 16h when no key available
static void
handle_1590(struct bregs *regs)
static void
handle_154f(struct bregs *regs)
{
- // set_fail(regs); -- don't report this failure.
- set_cf(regs, 1);
+ set_invalid_silent(regs);
}
static void
static void
handle_15c1(struct bregs *regs)
{
- regs->es = GET_BDA(ebda_seg);
+ regs->es = get_ebda_seg();
set_success(regs);
}
// regs.u.r16.ax = 0;
// regs.u.r16.bx = 0;
- u32 rs = GET_EBDA(ram_size);
+ u32 rs = GET_GLOBAL(RamSize);
// Get the amount of extended memory (above 1M)
if (rs > 16*1024*1024) {
set_success(regs);
}
+// Info on e820 map location and size.
+struct e820entry e820_list[CONFIG_MAX_E820] VAR16VISIBLE;
+int e820_count VAR16VISIBLE;
+
static void
-set_e820_range(struct bregs *regs, u32 start, u32 end, u16 type, int last)
+handle_15e820(struct bregs *regs)
{
- u32 size = end - start;
- SET_FARVAR(regs->es, *(u64*)(regs->di+0), start);
- SET_FARVAR(regs->es, *(u64*)(regs->di+8), size);
- SET_FARVAR(regs->es, *(u16*)(regs->di+16), type);
- SET_FARVAR(regs->es, *(u16*)(regs->di+18), 0x0);
+ int count = GET_GLOBAL(e820_count);
+ if (regs->edx != 0x534D4150 || regs->bx >= count
+ || regs->ecx < sizeof(e820_list[0])) {
+ set_code_invalid(regs, RET_EUNSUPPORTED);
+ return;
+ }
- if (last)
+ memcpy_far(regs->es, (void*)(regs->di+0)
+ , get_global_seg(), &e820_list[regs->bx]
+ , sizeof(e820_list[0]));
+ if (regs->bx == count-1)
regs->ebx = 0;
else
regs->ebx++;
regs->eax = 0x534D4150;
- regs->ecx = 0x14;
+ regs->ecx = sizeof(e820_list[0]);
set_success(regs);
}
-// XXX - should create e820 memory map in post and just copy it here.
-static void
-handle_15e820(struct bregs *regs)
-{
- if (regs->edx != 0x534D4150) {
- set_code_fail(regs, RET_EUNSUPPORTED);
- return;
- }
-
- u32 extended_memory_size = GET_EBDA(ram_size);
- // greater than EFF00000???
- if (extended_memory_size > 0xf0000000)
- // everything after this is reserved memory until we get to 0x100000000
- extended_memory_size = 0xf0000000;
-
- switch (regs->bx) {
- case 0:
- set_e820_range(regs, 0x0000000L, 0x0009fc00L, E820_RAM, 0);
- break;
- case 1:
- set_e820_range(regs, 0x0009fc00L, 0x000a0000L, E820_RESERVED, 0);
- break;
- case 2:
- set_e820_range(regs, 0x000e8000L, 0x00100000L, E820_RESERVED, 0);
- break;
- case 3:
- set_e820_range(regs, 0x00100000L
- , extended_memory_size - CONFIG_ACPI_DATA_SIZE
- , E820_RAM, 0);
- break;
- case 4:
- set_e820_range(regs,
- extended_memory_size - CONFIG_ACPI_DATA_SIZE,
- extended_memory_size, E820_ACPI, 0);
- break;
- case 5:
- /* 256KB BIOS area at the end of 4 GB */
- set_e820_range(regs, 0xfffc0000L, 0x00000000L, E820_RESERVED, 1);
- break;
- default: /* AX=E820, DX=534D4150, BX unrecognized */
- set_code_fail(regs, RET_EUNSUPPORTED);
- }
-}
-
static void
handle_15e8XX(struct bregs *regs)
{
- set_code_fail(regs, RET_EUNSUPPORTED);
+ set_code_unimplemented(regs, RET_EUNSUPPORTED);
}
static void
static void
handle_15XX(struct bregs *regs)
{
- set_code_fail(regs, RET_EUNSUPPORTED);
+ set_code_unimplemented(regs, RET_EUNSUPPORTED);
}
// INT 15h System Services Entry Point
void VISIBLE16
handle_15(struct bregs *regs)
{
- //debug_enter(regs);
+ debug_enter(regs, DEBUG_HDL_15);
switch (regs->ah) {
case 0x24: handle_1524(regs); break;
case 0x4f: handle_154f(regs); break;
case 0x52: handle_1552(regs); break;
case 0x53: handle_1553(regs); break;
+ case 0x5f: handle_155f(regs); break;
case 0x83: handle_1583(regs); break;
case 0x86: handle_1586(regs); break;
case 0x87: handle_1587(regs); break;
case 0x88: handle_1588(regs); break;
+ case 0x89: handle_1589(regs); break;
case 0x90: handle_1590(regs); break;
case 0x91: handle_1591(regs); break;
case 0xc0: handle_15c0(regs); break;
default: handle_15XX(regs); break;
}
}
-
-// INT 12h Memory Size Service Entry Point
-void VISIBLE16
-handle_12(struct bregs *regs)
-{
- debug_enter(regs);
- regs->ax = GET_BDA(mem_size_kb);
-}
-
-// INT 11h Equipment List Service Entry Point
-void VISIBLE16
-handle_11(struct bregs *regs)
-{
- debug_enter(regs);
- regs->ax = GET_BDA(equipment_list_flags);
-}
-
-// INT 05h Print Screen Service Entry Point
-void VISIBLE16
-handle_05(struct bregs *regs)
-{
- debug_enter(regs);
-}
-
-// INT 10h Video Support Service Entry Point
-void VISIBLE16
-handle_10(struct bregs *regs)
-{
- debug_enter(regs);
- // dont do anything, since the VGA BIOS handles int10h requests
-}
-
-void VISIBLE16
-handle_nmi()
-{
- debug_isr();
- BX_PANIC("NMI Handler called\n");
-}
-
-// INT 75 - IRQ13 - MATH COPROCESSOR EXCEPTION
-void VISIBLE16
-handle_75()
-{
- debug_isr();
-
- // clear irq13
- outb(0, PORT_MATH_CLEAR);
- // clear interrupt
- eoi_both_pics();
- // legacy nmi call
- struct bregs br;
- memset(&br, 0, sizeof(br));
- call16_int(0x02, &br);
-}
projects / seabios.git / blobdiff