xref: /netbsd-src/sys/external/bsd/gnu-efi/dist/apps/route80h.c (revision d1b935f8e85510a16a1b49122bd2ccf5ad7e104c)
1 /*	$NetBSD: route80h.c,v 1.1.1.2 2018/08/16 18:17:47 jmcneill Exp $	*/
2 
3 #include <efi.h>
4 #include <efilib.h>
5 
6 /* this example program changes the Reserved Page Route (RPR) bit on ICH10's General
7  * Control And Status Register (GCS) from LPC to PCI.  In practical terms, it routes
8  * outb to port 80h to the PCI bus. */
9 
10 #define GCS_OFFSET_ADDR 0x3410
11 #define GCS_RPR_SHIFT 2
12 #define GCS_RPR_PCI 1
13 #define GCS_RPR_LPC 0
14 
15 #define VENDOR_ID_INTEL 0x8086
16 #define DEVICE_ID_LPCIF 0x3a16
17 #define DEVICE_ID_COUGARPOINT_LPCIF 0x1c56
18 
19 static EFI_HANDLE ImageHandle;
20 
21 typedef struct {
22 	uint16_t vendor_id;	/* 00-01 */
23 	uint16_t device_id;	/* 02-03 */
24 	char pad[0xEB];		/* 04-EF */
25 	uint32_t rcba;		/* F0-F3 */
26 	uint32_t reserved[3];	/* F4-FF */
27 } lpcif_t;
28 
set_bit(volatile uint32_t * flag,int bit,int value)29 static inline void set_bit(volatile uint32_t *flag, int bit, int value)
30 {
31 	uint32_t val = *flag;
32 	Print(L"current value is 0x%2x\n", val);
33 
34 	if (value) {
35 		val |= (1 << bit);
36 	} else {
37 		val &= ~(1 << bit);
38 	}
39 	Print(L"setting value to 0x%2x\n", val);
40 	*flag = val;
41 	val = *flag;
42 	Print(L"new value is 0x%2x\n", val);
43 }
44 
is_device(EFI_PCI_IO * pciio,uint16_t vendor_id,uint16_t device_id)45 static int is_device(EFI_PCI_IO *pciio, uint16_t vendor_id, uint16_t device_id)
46 {
47 	lpcif_t lpcif;
48 	EFI_STATUS rc;
49 
50 	rc = uefi_call_wrapper(pciio->Pci.Read, 5, pciio, EfiPciIoWidthUint16, 0, 2, &lpcif);
51 	if (EFI_ERROR(rc))
52 		return 0;
53 
54 	if (vendor_id == lpcif.vendor_id && device_id == lpcif.device_id)
55 		return 1;
56 	return 0;
57 }
58 
find_pci_device(uint16_t vendor_id,uint16_t device_id,EFI_PCI_IO ** pciio)59 static EFI_STATUS find_pci_device(uint16_t vendor_id, uint16_t device_id,
60 				EFI_PCI_IO **pciio)
61 {
62 	EFI_STATUS rc;
63 	EFI_HANDLE *Handles;
64 	UINTN NoHandles, i;
65 
66 	if (!pciio)
67 		return EFI_INVALID_PARAMETER;
68 
69 	rc = LibLocateHandle(ByProtocol, &PciIoProtocol, NULL, &NoHandles,
70 			     &Handles);
71 	if (EFI_ERROR(rc))
72 		return rc;
73 
74 	for (i = 0; i < NoHandles; i++) {
75 		void *pciio_tmp = NULL;
76 		rc = uefi_call_wrapper(BS->OpenProtocol, 6, Handles[i],
77 				    &PciIoProtocol, &pciio_tmp, ImageHandle,
78 				    NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
79 		if (EFI_ERROR(rc))
80 			continue;
81 		*pciio = pciio_tmp;
82 		if (!is_device(*pciio, vendor_id, device_id)) {
83 			*pciio = NULL;
84 			continue;
85 		}
86 
87 		return EFI_SUCCESS;
88 	}
89 	return EFI_NOT_FOUND;
90 }
91 
92 EFI_STATUS
efi_main(EFI_HANDLE image_handle,EFI_SYSTEM_TABLE * systab)93 efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab)
94 {
95 	InitializeLib(image_handle, systab);
96 	EFI_PCI_IO *pciio = NULL;
97 	lpcif_t lpcif;
98 	EFI_STATUS rc = EFI_SUCCESS;
99 	struct {
100 		uint16_t vendor;
101 		uint16_t device;
102 	} devices[] = {
103 		{ VENDOR_ID_INTEL, DEVICE_ID_LPCIF },
104 		{ VENDOR_ID_INTEL, DEVICE_ID_COUGARPOINT_LPCIF },
105 		{ 0, 0 }
106 	};
107 	int i;
108 
109 	ImageHandle = image_handle;
110 	for (i = 0; devices[i].vendor != 0; i++) {
111 		rc = find_pci_device(devices[i].vendor, devices[i].device, &pciio);
112 		if (EFI_ERROR(rc))
113 			continue;
114 	}
115 
116 	if (rc == EFI_NOT_FOUND) {
117 		Print(L"Device not found.\n");
118 		return rc;
119 	} else if (EFI_ERROR(rc)) {
120 		return rc;
121 	}
122 
123 	rc = uefi_call_wrapper(pciio->Pci.Read, 5, pciio, EfiPciIoWidthUint32,
124 		EFI_FIELD_OFFSET(lpcif_t, rcba), 1, &lpcif.rcba);
125 	if (EFI_ERROR(rc))
126 		return rc;
127 	if (!(lpcif.rcba & 1)) {
128 		Print(L"rcrb is not mapped, cannot route port 80h\n");
129 		return EFI_UNSUPPORTED;
130 	}
131 	lpcif.rcba &= ~1UL;
132 
133 	Print(L"rcba: 0x%8x\n", lpcif.rcba, lpcif.rcba);
134 	set_bit((uint32_t *)(intptr_t)(lpcif.rcba + GCS_OFFSET_ADDR),
135 		     GCS_RPR_SHIFT, GCS_RPR_PCI);
136 
137 	return EFI_SUCCESS;
138 }
139