1 /*-------------------------------------------------------------------------
3 device.c - Accomodates subtle variations in PIC devices
4 Written By - Scott Dattalo scott@dattalo.com
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 -------------------------------------------------------------------------*/
22 PIC device abstraction
24 There are dozens of variations of PIC microcontrollers. This include
25 file attempts to abstract those differences so that SDCC can easily
32 /* memRange - a structure to define a range of valid memory addresses
34 * The Memory of most PICs (and other micros) is a collection of
35 * disjoint chunks. The memRange structure will define the start
36 * and end address of one of these chunks. The memory map of a
37 * particular device is a collection of memRange struct's.
40 typedef struct memRange {
41 int start_address; /* first address in range */
42 int end_address; /* last */
43 int alias; /* bit mask defining how/if memory range is aliased
44 * e.g. alias = 0x80 means start_address is identical
45 * to the memory location at (0x80 | start_address) */
46 int bank; /* PIC memory bank this range occupies */
50 /* AssignedMemory - A structure to keep track of the memory that has been used.
52 * When a register gets assigned an address this struct is used to
53 * keep track of a few details about the register. There is one of
54 * these structures for each memory location in the device.
57 typedef struct AssignedMemory {
58 regs *reg; /* Pointer to the register (NULL if this is an invalid address) */
59 int instance; /* the i'th byte of a multibyte register */
60 int alias; /* Bit mapping of aliased addresses (see memRange) */
61 int bank; /* Memory bank of this register */
62 int isValid:1; /* True if the address is legal */
63 int isSFR:1; /* True if the address is that of a Special Function reg */
64 int isEmitted:1; /* True if the register has been written to a cBlock */
70 * finalMapping - Dynamically allocated array that records the register assignments
73 extern AssignedMemory *finalMapping;
74 #define PROCESSOR_NAMES 4
75 /* Processor unique attributes */
76 typedef struct PIC_device {
77 char *name[PROCESSOR_NAMES];/* aliases for the processor name */
79 memRange *ram; /* RAM memory map */
80 memRange *sfr; /* SFR memory map */
82 int maxRAMaddress; /* maximum value for a data address */
83 int defMaxRAMaddrs; /* default maximum value for a data address */
84 int bankMask; /* Bitmask that is ANDed with address to extract banking bits */
85 // int hasAliasedRAM:1; /* True if there are bank independent registers */
89 /* Given a pointer to a register, this macro returns the bank that it is in */
90 #define REG_ADDR(r) ((r)->isBitField ? (((r)->address)>>3) : (r)->address)
91 #define REG_BANK(r) (finalMapping[REG_ADDR(r)].bank)
92 #define REG_isALIASED(r) (finalMapping[REG_ADDR(r)].alias != 0)
93 #define REG_isVALID(r) (finalMapping[REG_ADDR(r)].isValid)
96 /****************************************/
97 void assignConfigWordValue(int address, int value);
98 int getConfigWord(int address);
99 int isREGinBank(regs *reg, int bank);
100 int REGallBanks(regs *reg);
101 void addMemRange(memRange *r, int type);
102 void setMaxRAM(int size);
103 void setDefMaxRam(void);
104 unsigned getMaxRam(void);
106 #endif /* __DEVICE_H__ */