1 // Code for handling calls to "post" that are resume related.
3 // Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU LGPLv3 license.
7 #include "util.h" // dprintf
8 #include "ioport.h" // outb
9 #include "pic.h" // eoi_pic2
10 #include "biosvar.h" // struct bios_data_area_s
11 #include "bregs.h" // struct bregs
12 #include "acpi.h" // find_resume_vector
14 // Reset DMA controller
18 // first reset the DMA controllers
19 outb(0, PORT_DMA1_MASTER_CLEAR);
20 outb(0, PORT_DMA2_MASTER_CLEAR);
22 // then initialize the DMA controllers
23 outb(0xc0, PORT_DMA2_MODE_REG);
24 outb(0x00, PORT_DMA2_MASK_REG);
27 // Handler for post calls that look like a resume.
29 handle_resume(u8 status)
34 dprintf(1, "In resume (status=%d)\n", status);
38 if (CONFIG_S3_RESUME) {
39 // S3 resume request. Jump to 32bit mode to handle the resume.
45 : : "i"(BUILD_S3RESUME_STACK_ADDR), "r"(0)
54 // Normal post - now that status has been cleared a reset will
55 // run regular boot code..
60 // flush keyboard (issue EOI) and jump via 40h:0067h
64 #define BDA_JUMP_IP (((struct bios_data_area_s *)0)->jump_ip)
65 // resume execution by jump via 40h:0067h
69 : : "m"(BDA_JUMP_IP), "r"(SEG_BDA)
74 // resume execution via IRET via 40h:0067h
79 : : "m"(BDA_JUMP_IP), "r"(SEG_BDA)
84 // resume execution via RETF via 40h:0067h
89 : : "m"(BDA_JUMP_IP), "r"(SEG_BDA)
94 panic("Unimplemented shutdown status: %02x\n", status);
101 if (!CONFIG_S3_RESUME)
102 panic("S3 resume support not compiled in.\n");
104 dprintf(1, "In 32bit resume\n");
108 make_bios_readonly();
110 u32 s3_resume_vector = find_resume_vector();
112 // Invoke the resume vector.
114 memset(&br, 0, sizeof(br));
115 if (s3_resume_vector) {
116 dprintf(1, "Jump to resume vector (%x)\n", s3_resume_vector);
117 br.ip = FLATPTR_TO_OFFSET(s3_resume_vector);
118 br.cs = FLATPTR_TO_SEG(s3_resume_vector);
120 dprintf(1, "No resume vector set!\n");
121 // Jump to the post vector to restart with a normal boot.
122 br.ip = (u32)reset_vector - BUILD_BIOS_ADDR;