4 ;;;; Machine Architecture parameters:
6 (def!constant n-word-bits 32
7 "Number of bits per word where a word holds one lisp descriptor.")
9 (def!constant n-byte-bits 8
10 "Number of bits per byte where a byte is the smallest addressable object.")
12 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
13 "Number of bits to shift between word addresses and byte addresses.")
15 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
16 "Number of bytes in a word.")
18 (def!constant float-sign-shift 31)
20 (def!constant single-float-bias 126)
21 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equal)
22 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equal)
23 (def!constant single-float-normal-exponent-min 1)
24 (def!constant single-float-normal-exponent-max 254)
25 (def!constant single-float-hidden-bit (ash 1 23))
26 (def!constant single-float-trapping-nan-bit (ash 1 22))
28 (def!constant double-float-bias 1022)
29 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equal)
30 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equal)
31 (def!constant double-float-normal-exponent-min 1)
32 (def!constant double-float-normal-exponent-max #x7FE)
33 (def!constant double-float-hidden-bit (ash 1 20))
34 (def!constant double-float-trapping-nan-bit (ash 1 19))
36 (def!constant single-float-digits
37 (+ (byte-size single-float-significand-byte) 1))
39 (def!constant double-float-digits
40 (+ (byte-size double-float-significand-byte) n-word-bits 1))
42 (def!constant float-inexact-trap-bit (ash 1 0))
43 (def!constant float-underflow-trap-bit (ash 1 1))
44 (def!constant float-overflow-trap-bit (ash 1 2))
45 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
46 (def!constant float-invalid-trap-bit (ash 1 4))
48 (def!constant float-round-to-nearest 0)
49 (def!constant float-round-to-zero 1)
50 (def!constant float-round-to-positive 2)
51 (def!constant float-round-to-negative 3)
53 (defconstant-eqx float-rounding-mode (byte 2 7) #'equal)
54 (defconstant-eqx float-sticky-bits (byte 5 27) #'equal)
55 (defconstant-eqx float-traps-byte (byte 5 0) #'equal)
56 (defconstant-eqx float-exceptions-byte (byte 5 27) #'equal)
57 (def!constant float-condition-bit (ash 1 26))
58 (def!constant float-fast-bit 0) ; No fast mode on HPPA.
62 ;;;; Description of the target address space.
64 ;;; Where to put the different spaces.
66 (def!constant read-only-space-start #x20000000)
67 (def!constant read-only-space-end #x24000000)
69 (def!constant static-space-start #x28000000)
70 (def!constant static-space-end #x2a000000)
72 (def!constant dynamic-space-start #x30000000)
73 (def!constant dynamic-space-end #x37fff000)
75 (def!constant dynamic-0-space-start #x30000000)
76 (def!constant dynamic-0-space-end #x37fff000)
77 (def!constant dynamic-1-space-start #x38000000)
78 (def!constant dynamic-1-space-end #x3ffff000)
80 ;;; FIXME: WTF are these for?
82 ;; The space-register holding the lisp heap.
83 (def!constant lisp-heap-space 5)
85 ;; The space-register holding the C text segment.
86 (def!constant c-text-space 4)
89 ;;;; Other random constants.
91 (defenum (:suffix -trap :start 8)
98 single-step-breakpoint)
100 (defenum (:prefix trace-table-)
110 ;;; These symbols are loaded into static space directly after NIL so
111 ;;; that the system can compute their address by adding a constant
114 ;;; The fdefn objects for the static functions are loaded into static
115 ;;; space directly after the static symbols. That way, the raw-addr
116 ;;; can be loaded directly out of them by indirecting relative to NIL.
118 (defparameter *static-symbols*
121 ;; The C startup code must fill these in.
124 ;; Functions that the C code needs to call
126 sb!kernel::internal-error
127 sb!kernel::control-stack-exhausted-error
128 sb!di::handle-breakpoint
129 sb!impl::fdefinition-object
132 *read-only-space-free-pointer*
133 *static-space-free-pointer*
134 *initial-dynamic-space-free-pointer*
136 ;; Things needed for non-local-exit.
137 *current-catch-block*
138 *current-unwind-protect-block*
140 *binding-stack-start*
141 *control-stack-start*
144 ;; Interrupt Handling
145 *free-interrupt-context-index*
146 sb!unix::*interrupts-enabled*
147 sb!unix::*interrupt-pending*
150 (defparameter *static-funs*
161 sb!kernel:two-arg-and
162 sb!kernel:two-arg-ior
163 sb!kernel:two-arg-xor
164 sb!kernel:two-arg-gcd
165 sb!kernel:two-arg-lcm