3 (def!constant n-word-bits 32
4 "Number of bits per word where a word holds one lisp descriptor.")
6 ;;; the natural width of a machine word (as seen in e.g. register width,
8 (def!constant n-machine-word-bits 32)
10 (def!constant n-byte-bits 8
11 "Number of bits per byte where a byte is the smallest addressable object.")
13 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
14 "Number of bits to shift between word addresses and byte addresses.")
16 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
17 "Number of bytes in a word.")
20 (def!constant float-sign-shift 31)
22 (def!constant single-float-bias 126)
23 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
24 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
25 (def!constant single-float-normal-exponent-min 1)
26 (def!constant single-float-normal-exponent-max 254)
27 (def!constant single-float-hidden-bit (ash 1 23))
28 (def!constant single-float-trapping-nan-bit (ash 1 22))
30 (def!constant double-float-bias 1022)
31 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
32 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
33 (def!constant double-float-normal-exponent-min 1)
34 (def!constant double-float-normal-exponent-max #x7FE)
35 (def!constant double-float-hidden-bit (ash 1 20))
36 (def!constant double-float-trapping-nan-bit (ash 1 19))
38 (def!constant single-float-digits
39 (+ (byte-size single-float-significand-byte) 1))
41 (def!constant double-float-digits
42 (+ (byte-size double-float-significand-byte) n-word-bits 1))
44 (def!constant float-inexact-trap-bit (ash 1 0))
45 (def!constant float-underflow-trap-bit (ash 1 1))
46 (def!constant float-overflow-trap-bit (ash 1 2))
47 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
48 (def!constant float-invalid-trap-bit (ash 1 4))
50 (def!constant float-round-to-nearest 0)
51 (def!constant float-round-to-zero 1)
52 (def!constant float-round-to-positive 2)
53 (def!constant float-round-to-negative 3)
55 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp)
56 (defconstant-eqx float-sticky-bits (byte 5 2) #'equalp)
57 (defconstant-eqx float-traps-byte (byte 5 7) #'equalp)
58 (defconstant-eqx float-exceptions-byte (byte 5 12) #'equalp)
59 (defconstant-eqx float-condition-bit (ash 1 23) #'equalp)
60 (def!constant float-fast-bit 0) ; No fast mode on PMAX.
63 ;;;; Description of the target address space.
65 ;;; Where to put the different spaces.
67 (def!constant read-only-space-start #x01000000)
68 (def!constant read-only-space-end #x05000000)
70 (def!constant static-space-start #x06000000)
71 (def!constant static-space-end #x08000000)
73 (def!constant dynamic-space-start #x08000000)
74 (def!constant dynamic-space-end #x0c000000)
76 (def!constant dynamic-0-space-start #x08000000)
77 (def!constant dynamic-0-space-end #x0c000000)
78 (def!constant dynamic-1-space-start #x0c000000)
79 (def!constant dynamic-1-space-end #x10000000)
82 ;;;; Other non-type constants.
84 (defenum (:suffix -flag)
88 (defenum (:suffix -trap :start 8)
97 (defenum (:prefix trace-table-)
105 ;;; Static symbols are loaded into static space directly after NIL so
106 ;;; that the system can compute their address by adding a constant
109 ;;; The fdefn objects for the static functions are loaded into static
110 ;;; space directly after the static symbols. That way, the raw-addr
111 ;;; can be loaded directly out of them by indirecting relative to NIL.
113 (defparameter *static-symbols*
119 sb!kernel::internal-error
120 sb!kernel::control-stack-exhausted-error
121 sb!di::handle-breakpoint
122 sb!impl::fdefinition-object
125 *read-only-space-free-pointer*
126 *static-space-free-pointer*
127 *initial-dynamic-space-free-pointer*
129 ;; Things needed for non-local-exit.
130 *current-catch-block*
131 *current-unwind-protect-block*
133 *binding-stack-start*
134 *control-stack-start*
137 ;; Interrupt Handling
138 *free-interrupt-context-index*
139 sb!unix::*interrupts-enabled*
140 sb!unix::*interrupt-pending*
143 (defparameter *static-funs*
144 '(sb!kernel:two-arg-+
156 sb!kernel:two-arg-and
157 sb!kernel:two-arg-ior
158 sb!kernel:two-arg-xor
160 sb!kernel:two-arg-gcd
161 sb!kernel:two-arg-lcm))