1 /* vbaparam.h 1.2 86/12/08 */ 2 3 /* 4 * Parameters related to the VERSAbus i/o configuration. 5 */ 6 7 /* 8 * VERSAbus i/o devices use either memory mapped interfaces 9 * or mapped i/o register banks, or some of both. Page tables 10 * are allocated at boot time by each device driver, as needed. 11 * VMEMmap is used to map a fixed size portion of the VERSAbus 12 * i/o space, while VMEMmap1 maps dynamically defined portions 13 * for devices which utilize shared i/o memory. VBmap is used 14 * for mapping kernel intermediate buffers for DMA devices which 15 * are incapable of utilizing user virtual addresses or which 16 * require page aligned i/o buffers. The size of the VMEMmap1 17 * VBmap tables must be large enough for the needs of all devices 18 * in the system. 19 */ 20 extern struct pte VMEMmap[], VMEMmap1[]; 21 extern caddr_t vmem1, vmemend; 22 extern struct pte VBmap[]; 23 extern caddr_t vbbase, vbend; 24 25 /* 26 * The following macros relate to the segmentation of the VERSAbus 27 * i/o space. 28 * 29 * The VERSAbus adapter segments the i/o space (as seen by the cpu) 30 * into three regions. Cpu accesses to the upper 64Kb of the i/o space 31 * generate VERSAbus cycles with a 16-bit address and a non-privileged 32 * short i/o space address modifier. Accesses to the next 1Mb - 64Kb 33 * generate 24-bit addresses and a non-privileged standard address 34 * modifier. Accesses to the remainder of the 1Gb i/o space generate 35 * 32-bit addresses with a non-privileged extended address modifier. 36 * Beware that 32-bit addresses generated from this region always have 37 * zero in the upper 2 bits; e.g. a reference to physical address fe000000 38 * results in a VERSAbus address of 3e000000. 39 */ 40 #define VBIO16BIT(a) (0xfffe0000 <= ((unsigned)(a))) 41 #define VBIO24BIT(a) \ 42 (0xff000000 <= ((unsigned)(a)) && ((unsigned)(a)) < 0xfffe0000) 43 #define VBIO32BIT(a) (((unsigned)(a)) < 0xff000000) 44 45 /* 46 * The following constants define the fixed size map of the 47 * VERSAbus i/o space. The values should reflect the range 48 * of i/o addresses used by all the controllers unprepared 49 * to allocate and initialize their own page maps. 50 */ 51 #define VBIOBASE 0xfff00000 /* base of VERSAbus address space */ 52 #define VBIOEND 0xffffee45 /* last address in mapped space */ 53 /* number of entries in the system page table for i/o space */ 54 #define VBIOSIZE btoc(VBIOEND-VBIOBASE) 55 /* is device in mapped region */ 56 #define VBIOMAPPED(a) \ 57 (VBIOBASE <= ((unsigned)(a)) && ((unsigned)(a)) <= VBIOEND) 58 #define vboff(addr) ((int)(((caddr_t)(addr)) - VBIOBASE)) 59 60 /* 61 * Page table map sizes. 62 * 63 * Current VBmap allotments are: 64 * 4 vd controllers 32+1 pte's 65 * 2 cy controllers 32+1 pte's 66 * Current VBMEMmap allotments are: 67 * 2 ace controllers 32+1 pte's 68 */ 69 #define VBPTSIZE (((4*(32+1))+2*(32+1)+3) &~ 3) 70 #define VBMEMSIZE ((2*(32+1)+3) &~ 3) 71