3 (def!constant n-word-bits 32
4 "Number of bits per word where a word holds one lisp descriptor.")
6 (def!constant n-byte-bits 8
7 "Number of bits per byte where a byte is the smallest addressable object.")
9 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
10 "Number of bits to shift between word addresses and byte addresses.")
12 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
13 "Number of bytes in a word.")
16 (def!constant float-sign-shift 31)
18 (def!constant single-float-bias 126)
19 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
20 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
21 (def!constant single-float-normal-exponent-min 1)
22 (def!constant single-float-normal-exponent-max 254)
23 (def!constant single-float-hidden-bit (ash 1 23))
24 (def!constant single-float-trapping-nan-bit (ash 1 22))
26 (def!constant double-float-bias 1022)
27 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
28 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
29 (def!constant double-float-normal-exponent-min 1)
30 (def!constant double-float-normal-exponent-max #x7FE)
31 (def!constant double-float-hidden-bit (ash 1 20))
32 (def!constant double-float-trapping-nan-bit (ash 1 19))
34 (def!constant single-float-digits
35 (+ (byte-size single-float-significand-byte) 1))
37 (def!constant double-float-digits
38 (+ (byte-size double-float-significand-byte) n-word-bits 1))
40 (def!constant float-inexact-trap-bit (ash 1 0))
41 (def!constant float-underflow-trap-bit (ash 1 1))
42 (def!constant float-overflow-trap-bit (ash 1 2))
43 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
44 (def!constant float-invalid-trap-bit (ash 1 4))
46 (def!constant float-round-to-nearest 0)
47 (def!constant float-round-to-zero 1)
48 (def!constant float-round-to-positive 2)
49 (def!constant float-round-to-negative 3)
51 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp)
52 (defconstant-eqx float-sticky-bits (byte 5 2) #'equalp)
53 (defconstant-eqx float-traps-byte (byte 5 7) #'equalp)
54 (defconstant-eqx float-exceptions-byte (byte 5 12) #'equalp)
55 (defconstant-eqx float-condition-bit (ash 1 23) #'equalp)
56 (def!constant float-fast-bit 0) ; No fast mode on PMAX.
59 ;;;; Description of the target address space.
61 ;;; Where to put the different spaces.
63 (def!constant read-only-space-start #x01000000)
64 (def!constant read-only-space-end #x05000000)
66 (def!constant static-space-start #x06000000)
67 (def!constant static-space-end #x08000000)
69 (def!constant dynamic-space-start #x08000000)
70 (def!constant dynamic-space-end #x0c000000)
72 (def!constant dynamic-0-space-start #x08000000)
73 (def!constant dynamic-0-space-end #x0c000000)
74 (def!constant dynamic-1-space-start #x0c000000)
75 (def!constant dynamic-1-space-end #x10000000)
78 ;;;; Other non-type constants.
80 (defenum (:suffix -flag)
84 (defenum (:suffix -trap :start 8)
93 (defenum (:prefix trace-table-)
101 ;;; Static symbols are loaded into static space directly after NIL so
102 ;;; that the system can compute their address by adding a constant
105 ;;; The fdefn objects for the static functions are loaded into static
106 ;;; space directly after the static symbols. That way, the raw-addr
107 ;;; can be loaded directly out of them by indirecting relative to NIL.
109 (defparameter *static-symbols*
115 sb!kernel::internal-error
116 sb!kernel::control-stack-exhausted-error
117 sb!di::handle-breakpoint
118 sb!impl::fdefinition-object
121 *read-only-space-free-pointer*
122 *static-space-free-pointer*
123 *initial-dynamic-space-free-pointer*
125 ;; Things needed for non-local-exit.
126 *current-catch-block*
127 *current-unwind-protect-block*
129 ;; Interrupt Handling
130 *free-interrupt-context-index*
131 sb!unix::*interrupts-enabled*
132 sb!unix::*interrupt-pending*
135 (defparameter *static-funs*
136 '(sb!kernel:two-arg-+
148 sb!kernel:two-arg-and
149 sb!kernel:two-arg-ior
150 sb!kernel:two-arg-xor
152 sb!kernel:two-arg-gcd
153 sb!kernel:two-arg-lcm))